What is the tiny, massive central part of the atom?

• Neutron
• Electron
• Proton
• Nucleus

Tags

NGSS.HS-PS1-8

Who discovered the nucleus of an atom?

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Democritus

What are electrons?

• Massive, positively charged particles
• Tiny, negatively charged particles
• Clouds of dust in the nucleus
• Neutral particles around the nucleus

Tags

NGSS.MS-PS1-1

Whose model is most similar to the solar system?

• Bohr
• Thomson
• Rutherford
• Dalton

Tags

NGSS.HS-ESS1-4

What element is represented in this Bohr Model? 

• Carbon
• Hydrogen
• Aluminum
• Lithium

Tags

NGSS.HS-PS1-1

How many electrons does potassium K contain? 

• 19
• 39
• 20
• 40

Tags

NGSS.HS-PS1-1

How many electrons are in the outer most shell of Sodium (Na)?

• 3
• 1
• 2
• 4

Tags

NGSS.HS-PS1-1

What identifies the element?

• Protons
• Neutrons
• valence electrons
• Nucleus

Which following atom has the biggest mass?

• Hydrogen
• Helium
• Boron
• Argon

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0