ATOMIC GRADE 7 REVIEW

Multiple Choice

Which of the following is the nucleus?

• A

• B

• C

• D

Multiple Choice

What particle is B?

• electron

• proton

• nucleus

• neutron

Fill in the Blank

If B is proton, so what is D then?

Multiple Choice

One particle in an atom is electron, which one is it?

• A

• B

• C

• D

Atomic Mass and Mass Number

Module 3 - Physical Science

The Periodic Table of Elements

• The Periodic Table is an organizational tool used by scientists to place elements into different categories.

• Elements are the building blocks of matter, each having different chemical and physical properties.

• Today, we will be looking at what atoms are composed of, and how we describe those atoms.

Review

• The atomic number is the number of protons in the element.

• The atomic mass is the number of protons and neutrons in one atom of that element.

• All elements are electrically neutral, meaning they have ZERO NET CHARGE. This means that the number of protons (positive charges) are equal to the number of neutrons (negative charges)

Review

• The element Helium (He) has an Atomic Number of 2. This means that all Helium atoms have exactly two protons.

• Since the atom is electrically neutral, that means the atom also has exactly two electrons.

• How do we determine how many neutrons there are in an atom?

Review

• Atomic Mass = Protons + Neutrons

• We round the atomic mass to the nearest whole number, 4

• Since we already determined that Helium has two protons, that means: 4=2+Neutrons

• There must be 2 Neutrons in one atom of Helium

Let's Practice Together!

• What is the Atomic Number?

• What is the Atomic Mass?

• How many protons are in a Lithium Atom?

• How many electrons are in a Lithium Atom?

• What is the rounded Atomic Mass?

• How many neutrons are in a Lithium Atom?

Let's Practice Together!

• What is the Atomic Number? 3

• What is the Atomic Mass? 6.941

• How many protons are in a Lithium Atom? 3

• How many electrons are in a Lithium Atom? 3

• What is the rounded Atomic Mass? 7

• How many neutrons are in a Lithium Atom? 7-3=4

Multiple Choice

What is the Atomic Number for Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Multiple Choice

What is the Atomic Mass for Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Multiple Choice

How many Protons are in one atom of Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Multiple Choice

How many Electrons are in one atom of Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Multiple Choice

What is the Rounded Mass of Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Multiple Choice

How many neutrons are in one atom of Beryllium (Be)?

• 4

• 9.012

• 9

• 5

Elements, Compounds and Mixtures

​U1L1

Elements

​

• There are more than 100 different different elements

• An element is a type of atom with the same number of protons

• The term element is also used to describe a substance that is made of the same type of atom

• ​Elements are pure chemical substances. 

​Compound

• Elements can chemically combine to form new, pure chemical substances. 

• A chemical substance that is made of two or more different elements that chemically combine together is called a compound

• The force between compounds is STRONGER than between mixtures​

​Mixture

• A compound is NOT the same as a mixture

• A mixture is a physical combination of two or more different chemical substances.

• A compound is a chemical combination of two or more different chemical substances (specifically, elements)

• Unlike an element and compound, a mixture is NOT a pure chemical substance

Multiple Choice

This is an example of a(n)...

• Element

• Compound

• Mixture

• Atom

Multiple Choice

This is an example of a(n)...

• Element

• Compound

• Mixture

• Molecule

Multiple Choice

A(n) _____ is a type of atom with the same number of protons

• Element

• Compound

• Mixture

• Molecule

Multiple Choice

A chemical substance that is made of two or more DIFFERENT elements that chemically combine together

• Element

• Compound

• Mixture

• Molecule

All of the known elements of the world can be found on the periodic table.

​

In different combinations, they are the building blocks of all matter!​

​Elements

​

Compounds are two or more DIFFERENT elements chemcially bonded together. This means that they cannot be separated easily. ​

​

​Compounds

​

A mixture is a material made up of two or more different substances which are not chemically bonded. This means that the substances keep their original properties.

​Mixtures

​

General properties of a mixture:

● The components of a mixture can be easily separated

● The components each keep their original properties

​

​Characteristics of Mixtures

​

Multiple Select

Which of the following are examples of Mixtures?

• The atmosphere

  (N + O + Ar + H₂O...)

• Carbon Dioxide (CO₂)

• Oxygen

  (O₂₎

• Lemonade

  (sugar, lemon juice, water)

• Anything on the Periodic Table

Multiple Select

Which of the following are examples of ELEMENTS? Choose all that are correct.

• Oxygen (O)

• Water

  (H₂O)

• Flourine

  (F)

• Lemonade

• Sulfur Dioxide (SO₂)

Multiple Select

Which of the following are examples of compounds? Check all that apply.

• Salt

  (NaCl)

• Salt Water

  (NaCl and H₂O)

• Sugar

  (C₆H₁₂O₆)

• Carbon Dioxide

  (CO₂)

Chemical Compounds

By David Stanford

Chemical Compounds

The element names are represented by a single uppercase letter or an uppercase letter followed by a lowercase letter.

​

Example: Ne (neon), C (carbon), Pb(lead)​

Some text here about the topic of discussion

Chemical Compounds

Subscripts are the numbers written on the lower right side of the element symbol, this tells you the number of atoms of that element.

​

Example: O₂ (two atoms of oxygen)

Some text here about the topic of discussion

Chemical Compounds

If an element symbol has no subscript there is only one atom of that element in that molecule.

​

Example: O₂ (two atoms of oxygen) O (one atom of oxygen)

H₂O (2 atoms hydrogen and 1 atom oxygen)​

Some text here about the topic of discussion

Chemical Compounds

If an element symbol has no subscript there is only one atom of that element in that molecule.

​

Example: O₂ (two atoms of oxygen) O (one atom of oxygen)

H₂O (2 atoms hydrogen and 1 atom oxygen)​

Some text here about the topic of discussion

Multiple Choice

How many atoms of oxygen are in H₂O?

• 1

• 2

• 3

• 4

Multiple Choice

How many atoms of hydrogen are in H₂O?

• 1

• 2

• 3

• 4