Atoms, Isotopes, and Ions

Atoms, Isotopes, and Ions

​-"regular" version of carbon

-the carbon listed in the periodic table

-the most abundant version of carbon in nature​

​​Carbon atom

-different forms of an element, same number of protons and electrons but NOT neutrons​

​​Isotope

Multiple Choice

Which isotope of carbon is the most abundant in nature, thus, listed in the periodic table?

• carbon-12

• carbon-13

• carbon-14

Multiple Choice

An atom and an isotope describe the SAME element. How are they different?

• chemical name

• number of protons

• number of neutrons

• number of electrons

Multiple Choice

The element in the box has how many neutrons?

• 55

• 56

• 78

• 133

Multiple Choice

How many neutrons an atom of strontium-86 has?

• 38

• 48

• 86

• 88

Multiple Choice

How to determine the number of neutrons of a strontium-86 isotope?

• add the protons and neutrons

• subtract the atomic number from the mass number, 86

• add protons and electrons

• subtract the mass number, 86, from the atomic number

Multiple Choice

The cesium atom in the box has how many protons and electrons?

• 55 protons, 55 electrons

• 55 protons, 78 electrons

• 78 protons, 55 electrons

• 55 protons, 132 electrons

Multiple Choice

What is the atomic number of the bromine atom?

• 35

• 45

• 80

​​More examples:

​¹⁶₈O or O-16

​

³⁵₁₇Cl​ or Cl-35

​

​

​.

​Isotope Notation

Multiple Select

What are isotopes?

• elements with different protons and electrons

• different "versions" of an element

• same element with different number of neutrons and mass number

Multiple Select

The isotope ⁴¹₂₀Ca has

• 20 protons, 20 electrons, 41 neutrons

• 20 protons, 20 electrons, 20 atomic number

• 20 protons, 20 electrons, 21 neutrons, 41 atomic mass unit

​Isotope Notation of Charge Ion​

Aluminum ion has + 3 charge

​

Therefore,​

#of protons=13

#of electrons=10, why only 10???

#of neutrons=14​

​

​Atoms- are neutral

Ions- are charge atoms​

​

​Steps:

#of neutrons: 27-13=14​

​

#of electrons: 13-3=10​

why subract 3? because aluminum ion gives away 3 electrons​ during reactions

Multiple Choice

Which is the atomic number and mass number of magnesium in the picture?

• atomic number=22

  mass number=12

• atomic number=12

  mass number=22

Multiple Choice

How many neutrons in this magnesium isotope?

• 2

• 10

• 12

• 22

Multiple Choice

The charge of magnesium ion is +2, which means

• magnesium gains 2 electrons

• magnesium give away 2 electrons

• magnesium gains 2 protons

• magnesium give away protons

​Barium ion has +2 charge, and

​

protons=56

​electrons=56-​2=54

neutrons=​141-56=85

​

​The number of protons identifies the name of an element, therefore, its STAYS the same!

​Remember: Atoms can only give away or gain electrons(the negative particles) during bonding with another atom.

Multiple Choice

Barium ion has a +2 charge, it means its protons is more by 2 than its electrons. Which is the correct explanation?

• protons-56+2=58

  electrons-stays 56

• protons=stays 56

  electrons=56-2=54

Multiple Choice

Oxygen ion has a -2 charge, which means

• oxygen gains 2 electrons

• oxygen give away 2 electrons

Multiple Choice

Oxygen has a negative 2 charge because it has now more electrons. How many electrons in total for oxide?

• 8-2=6

• 8+2=10

• stays the same, 8

Multiple Choice

Which one is an ion?

Multiple Select

Which of the following is/are neutral atoms?