C2 Atoms, Elements and Compounds

C2 Atoms, Elements and Compounds

​Mr. Jake P. Villagonzalo

C2 Elements, compounds and mixtures learning objectives

Core

• Describe the structure of the atom as a central nucleus containing neutrons and protons, surrounded by electrons in shells.

• State the relative charges and relative masses of a proton, neutron and an electron

• Define proton number/atomic number as the number of protons in the nucleus of an atom

C2 Elements, compounds and mixtures learning objectives

Core

• Define mass number/nucleon number as the total number of protons and neutrons in the nucleus of an atom

• Determine the electronic configuration of elements with proton number 1 to 20, e.g. 2, 8, 3

• State that;

  a. Group VII noble gases have a full outer shell

  b. the number of outer-shell electrons is equal to the group number in Group I to VII

  c. the number occupied electron shells is equal to the period number

All substances can be classified into one of these three types.

​

C2.01:
Elements
Compounds
Mixtures

​Complete this worksheet. Do not move to the next slide if you have not completed this assignment.

​​Marking Scheme is found in the next slide. Do not move unless you have already completed the exercise.

​​Now, mark your work and revise the item that needs revision.

​​Marking Scheme is found in the next slide. Do not move unless you have already completed the exercise.

​​Marking Scheme is found in the next slide. Do not move unless you have already completed the exercise.

Multiple Choice

An Element is made up of how many types of atoms?

• 12

• 36

• 58

• 1

Multiple Choice

What is the building block of all matter?

• molecules

• substances

• compounds

• elements

Multiple Choice

How many different types of atoms are there in the following molecule?

• 7

• 3

• 6

• 8

Fill in the Blank

Classify the diagrams to ELEMENTS.

Write your answer by observing spacing between each letter.

Fill in the Blank

Classify the diagrams to COMPOUNDS.

Write your answer by observing spacing between each letter.

Fill in the Blank

Classify the diagrams to MIXTURES.

Write your answer by observing spacing between each letter.

Multiple Choice

Classify the picture with the correct label.

• element

• mixture of elements

• compound

• mixture of compounds

Multiple Choice

Classify the picture with the correct label.

• element

• mixture of elements and compounds

• compound

• mixture of elements

Multiple Choice

Classify the picture with the correct label.

• Element

• Mixture of Elements & Compounds

• Compound

• Mixture of Compounds

Multiple Choice

Substances can be broadly classified into three categories which are elements, compounds and mixtures.

Which of the following statements is correct?

• elements contain different atoms

• compounds consist of elements that are not chemically combined

• mixtures consist of elements that are chemically combined

• a mixture can contain elements and compounds

Our modern understanding of the structure of the atom (the atomic model) is based on the atomic theory put forward by the English chemist John Dalton in 1807. Dalton's idea was that ATOMS were the building blocks of the elements. He thought of them as indivisible particles that could join together to make molecules.

​

C2.01:
Atomic Structure
and the
Periodic Table

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Multiple Choice

Label the diagram of the atom.

Correct answers are according to the alphabet order

• neutron; electron; proton

• electron; proton; neutron

• proton; electron; neutron

• electron; neutron; proton

Multiple Choice

Which sub-atomic particles are found in the nucleus?

• protons and electrons

• protons and neutrons

• protons ONLY

• 
  Electrons only

Multiple Choice

________________ have a positive charge, ___________________ have NO charge, and _____________________ have a negative charge.

• Protons, Electrons, Neutrons

• Protons, Neutrons, Electrons

• Neutrons, Electrons, Protons

• 
  Electrons, Neutrons, Protons

Multiple Choice

What do you call the center of the atom and where the mass of an atom is mostly concentrated?

• shell

• orbital

• energy level

• nucleus

Multiple Select

What are the three sub-atomic particles of an atom?

Select all that applies.

• protons

• neutrons

• shell

• nucleus

• electrons

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Multiple Choice

Which option correctly describes the relative charges and masses of the subatomic particles?

• A

• B

• C

• D

In summary:

Multiple Choice

What is the atomic number?

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of protons in the energy levels

Multiple Choice

What is the mass number?

• 
  the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and neutrons in the nucleus

• 
  the number of protons and electrons in the atom

Multiple Choice

What is the atomic number of this atom?

• 1

• 4

• 3

• 7

Multiple Choice

Most of the mass in an atom is made up of _____________________?

• protons and electrons

• 
  neutrons and electrons

• 
  protons and neutrons

• 
  electrons only

Multiple Choice

In order for an atom to be neutral what has to be true?

• The atom has more protons than neutrons

• The atom has the same number of protons and neutrons

• The atom has more neutrons than protons

• The atom has the same number of protons and electrons

Multiple Choice

What does the C represent?

• atomic mass

• 
  element name

• 
  atomic number

• 
  chemical symbol 

Multiple Choice

What does the 6 represent?

• 
  Atomic mass

• chemical symbol

• 
  atomic number

• 
  element name

Multiple Choice

What is the mass number of this atom?

• 1

• 4

• 3

• 7

Multiple Choice

How is the number of neutrons in the nucleus of an atom calculated?

• Add the number of e- and p+ together

• 
  Subtract the number of p+ from the mass number

• 
  Subtract the number of e- from p+

• 
  Add the mass number to the number of e-

Multiple Choice

What subatomic particles would you find in the nucleus of an atom?

• 
  Protons only

• Neutrons and Electrons

• 
  Protons and Neutrons

• Protons and Electrons 

Multiple Choice

Which subatomic particles contribute the most to the mass of an atom?

• 
  Protons, Neutrons, Electrons

• 
  Protons and Electrons

• 
  Protons only

• 
  Protons and Neutrons

Multiple Choice

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 
  12 neutrons

• 
  12 protons

• 12 electrons

• 
  24 protons and neutrons

Multiple Choice

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 35

• 10

• 25

Multiple Choice

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11

• 6

• 5

• 16

Multiple Choice

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 16

• 31

• 47

Multiple Choice

Which of the following determines the identity of an element?

• number of protons

• 
  number of neutrons

• 
  

  atomic mass

• 
  number of shells

Now, get your worksheet and try this one out. Fill in the table with information about the number of protons, electrons and neutrons of the atom.​

​​Marking Scheme is found in the next slide. Do not move unless you have already completed the exercise.

​In 1913, Neils Bohr, working with Ernest Rutherford , developed a theory to explain how electrons were arranged in atoms. This theory helps to explain how the colours in the flame test are produced. We represent the position of electrons around the nucleus using the electron configuration.

C2.01:
Electronic
Configuration

​The next slide is a video about the electronic structure.
You can pause the video to take down important notes.

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Multiple Choice

How many electrons could fill in the first enegy level or the first electron shell of an atom?

• 1

• 2

• 4

• 8

Multiple Choice

How many electrons could fill in the second and third enegy level or the first electron shell of an atom?

• 2

• 4

• 8

• 16

• 32

Multiple Choice

The farther away the electron shell or orbital from the nucleus, the higher the energy will be.

• TRUE

• FALSE

Multiple Choice

Just like the planets of the solar system, the electrons of the atom orbit the __________.

• proton

• nucleus

• electron

• neutron

Fill in the Blank

This is a method to determine the atom's arrangement of the electrons within its electron shells or energy levels of an atom is called as _________________.

Multiple Choice

Each electron shell or orbitals have the same energy level.

• TRUE

• FALSE

• PERHAPS

• UNCERTAIN

Multiple Choice

The number of electrons outside the shell will determine the _________ of the periodic table of the elements.

• period

• atomic number

• group

• mass number

Multiple Choice

The number of electron shells (energy level) or orbitals will determine the _________ of the periodic table of the elements.

• period

• atomic number

• group

• mass number

Again:
-the number of shells (energy level) will determine the PERIOD of the periodic table of the elements
-the number of the electrons outside the electron shell determines the GROUP of the elements in the periodic table

Again:

-the number of shells (energy level) will determine the PERIOD of the periodic table of the elements

-the number of the electrons outside the electron shell determines the GROUP of the elements in the periodic table

Multiple Choice

Refer to the table shown on the left.

Which PERIOD does HYDROGEN can be found in the periodic table?

• 1

• 2

• 3

• 4

Again:
-the number of shells (energy level) will determine the PERIOD of the periodic table of the elements

-the number of the electrons outside the electron shell determines the GROUP of the elements in the periodic table

Multiple Choice

Refer to the table shown on the left.

Which PERIOD is CARBON found in the periodic table?

• 1

• 2

• 3

• 4

Multiple Choice

Refer to the table shown on the left.

Which PERIOD is CALCIUM found in the periodic table?

• 1

• 2

• 3

• 4

Multiple Choice

Refer to the table shown on the left.

Which GROUP is CALCIUM found in the periodic table?

• 1

• 2

• 3

• 4

Multiple Choice

Refer to the table shown on the left.

Which GROUP is CALCIUM found in the periodic table?

• 2

• 4

• 6

• 8

Multiple Choice

Refer to the table shown on the left.

Which GROUP is LITHIUM found in the periodic table?

• 1

• 2

• 4

• 8

Multiple Choice

Refer to the table shown on the left.

Which GROUP is SODIUM found in the periodic table?

• 1

• 2

• 4

• 8

Multiple Choice

Refer to the table shown on the left.

Which GROUP is SULFUR found in the periodic table?

• 2

• 4

• 6

• 8

Multiple Choice

The atomic number of element Q is 9 and its mass number is 19.

In which group of the Periodic Table should element Q be placed?

• Group 0

• Group I

• Group VII

• Group II

Multiple Choice

Which row of the table correctly describes the link between outer shells electrons, Group number and Period number?

• A

• B

• C

• D

Noble Gas Electronic Configuration

Multiple Select

Why do the elements in the noble gas unreactive?

Select all that applies.

• because the electron is already stable

• because the outer shell is already filled in with electrons

• because it is already full with electrons in its outer shell

• because the elements are non-reactive

Multiple Select

Why do the elements in the noble gas unreactive?

Select all that applies.

• because the electron is already stable

• because the outer shell is already filled in with electrons

• because it is already full with electrons in its outer shell

• because the elements are non-reactive

Isotopes are different atoms of the same element that contain the same number of protons but a different number of neutrons.

​

​Isotopes

Multiple Choice

Which two atoms are isotopes?

• A

• B

• C

• D

Multiple Choice

Which definition of isotopes is correct?

• atoms of the same element that have the same number of electrons and nucleons

• atoms of the same element that have the same number of neutrons and protons

• atoms of the same element that have the same number of protons but a different number of electrons

• atoms of the same element that have the same number of protons but a different number of nucleons

Multiple Choice

Refer to the illustration on the left.

Two isotopes of Carbon are shown in the picture.

Which statement about these two isotopes is correct?

• their electronic structure is different

• they have different number of nucleons

• they have different number of protons

• they have the same number of neutrons

Multiple Choice

An isotope of chromium is represented by the picture on the left.

Which statement about an atom of this isotope of chromium is correct?

• it contains 24 electrons

• it contains 24 neutrons

• it contains 28 protons

• it contains 52 neutrons

Extended

This is the end of the lesson!

You can redo this assignment to ensure mastery. Get ready for a revision test on Monday-October 9, 2023.

Strictly No Device and No Science Book.