G6-Atomic mass

Atomic Mass and Mass Number

​It's always a whole humber!

​Atomic number = Proton number
Proton number = Electron number in an atom

Multiple Choice

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Multiple Choice

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

Multiple Choice

What is the Atomic Number 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

​We can neglect
the mass of electrons.

​The mass number of
this helium atom is 2+2=4

​Atomic number = Proton number
Proton number = Electron number in an atom
Mass number = Protons + Neutrons

Element Symbol	​Atomic number	Number of protons	​​Number of electrons	​Number of neutrons	​Mass number
​Mg	​	​	​	​12	​
​	​17	​	​	​	​35

Multiple Choice

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Multiple Choice

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Multiple Choice

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

• 6

• 10

• 4

• 8

Multiple Choice

Isotopes of an element have a different number of...

• Protons

• Neutrons

• Electrons

• Mass

Multiple Choice

What is the name of the pictured isotope?

• Copper-29
• Copper-63
• Copper-34
• CopperWopperHopperBopper

Multiple Choice

Which of these is the correct way to write oxygen-18?

• A

• B

• C

• D

Multiple Choice

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Match

Match the following

• isotope

• proton

• atomic mass

• electrons

• nuetrons

element with different neutron numbers

determines the element identity

sum of protons and neutrons

negative charge found in the cloud

neutral charge, # makes isotopes

• element with different neutron numbers

• determines the element identity

• sum of protons and neutrons

• negative charge found in the cloud

• neutral charge, # makes isotopes

​Why the atomic mass in the periodic table is not a whole number?

Because it is the average mass number including all the natural isotopes!

Multiple Choice

What is the atomic mass of this element?

• 16

• 32

• 32.06

• 16.06