What does the Atomic Number tell us?

• The number of protons in an atom

• The number of electrons in the atom

• The number of neutrons in an atom

Tags

NGSS.MS-PS1-1

Each proton has a ______________ electrical charge.

• Positive

• Negative

• Neutral

• Shocking

Tags

NGSS.MS-PS2-3

Electrons move _______________ the nucleus.

• inside

• outside

• on top of

• without

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

Tags

NGSS.MS-PS1-1

If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?

• 10
• 20
• 30

If the mass number of this chlorine atom is 36, how many neutrons does it have?

• 17

• 18

• 19

• can't be determined

Tags

NGSS.MS-PS1-1

What subatomic particles would you find in the nucleus of an atom?

• Protons only
• Protons and Neutrons
• Neutrons and Electrons
• Protons and Electrons 

What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?

• 22
• 11
• 34
• 23

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

What particle uniquely identifies an element?

• Number of Valence Electrons
• Number of Protons
• Number of Electrons
• Atomic Mass