Zeisloft Atomic Theory & Mastering Measurement

Which subatomic particle does the atomic number identify?

• Neutron

• Proton

• Electron

• Nucleus

Why are atomic masses not whole numbers?

• Due to the presence of isotopes

• Because of electron mass

• Due to neutron decay

• Because of proton charge

What is the atomic number of Iron if its mass number is 56?

• 26

• 56

• 30

• 28

What is the mass number of Selenium-80?

• 80

• 34

• 46

• 78

What is the relative mass of a proton?

• 1 amu

• 0 amu

• 0.5 amu

• 2 amu

What is the relative mass of an electron?

• 1/1840 amu

• 1 amu

• 0.5 amu

• 2 amu

What is the relative mass of a neutron?

• 1 amu

• 0 amu

• 0.5 amu

• 2 amu

A proton has a ___________ charge.

• positive
• negative
• neutral

Tags

NGSS.MS-PS1-1

Smallest of the 3 subatomic particles

• protons

• neutrons

• electrons

What is at the center of every atom?

• an electron
• a compound
• a molecule
• a nucleus

Tags

NGSS.HS-PS1-8