Atomic mass - Atomic Number =

• protons
• neutrons
• electrons
• Average Mass

Isotopes are two atoms of the same element that differ in the number of....

• protons
• Electrons
• Neutrons
• IONS

An element is defined by its number of 

• protons
• electrons
• neutrons
• protons + electrons

Protons and neutrons are found in the....

• energy levels
• nucleus 
• space 
• Bohr Model 

Electrons are found in the....

• nucleus 
• energy levels 
• isotopes 
• protons 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the subatomic particles is the lightest

• all have the same mass
• protons 
• neutrons 
• electrons

Which of the subatomic particles is the heaviest?

• electrons 
• protons 
• neutrons 
• protons and neutrons have equal mass

^{What does the 6 represent above the C}

• Symbol 
• Name 
• Mass Number 
• Atomic Number 

How many electrons can be held in the first energy level ?

• 1
• 2
• 8
• 16

How many electrons can the 2nd energy level hold ?

• 2
• 4
• 8
• 16