In Niels Bohr’s model of the atom, electrons move  

• like balls rolling down a hill.
•  like popcorn in a popcorn popper.
•  like beach balls on water waves.
• like planets orbiting the sun.

A particle that moves around the nucleus is a(n)...

• Proton
• Neutron
• Electron
• Quark

Tags

NGSS.MS-PS1-1

True or False? Neutrons have a negative charge

• True
• False

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

Tags

NGSS.HS-PS1-8

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

Which is the smallest?

• electron
• proton
• atom
• neutron 

Which of the following has all of the subatomic particles that make up an atom?

• Protons, Nucleus, Electrons
• Neutrons, Nucleus, Protons
• Electrons, Quarks, Protons
• Electrons, Protons, Neutrons

Tags

NGSS.MS-PS1-1

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15
• 31
• 16
• 47

Tags

NGSS.MS-PS1-1

An atom has an atomic number of 30 and a mass number of 65. How many neutrons are in the atom?

• 30
• 65
• 35
• 95

Tags

NGSS.MS-PS1-1