7th grade Chemistry Test Review

Which subatomic particle tells the identity of an element?

• Electron

• Proton

• Neutron

• Nucleus

Which 3 things are always equal for an atom?

• Electrons, protons, and neutrons

• Atomic number, protons, electrons

• Mass number, atomic number, protons

• Atomic number, neutrons, electrons

How many protons are in this element?

• 12

• 8

• 7

• 6

What is the mass number for this element?

• 12

• 8

• 7

• 6

How many electrons are in this element?

• 39

• 19

• 20

• 21

How many neutrons are in this element?

• 39

• 19

• 20

• 40

How many neutrons does Sodium (Na) have?

• 11

• 23

• 34

• 12

These particles orbit around the nucleus of an atom.  What are they called?

• electrons
• protons
• neutrons
• photons

What does the nucleus consist of?

• Protons + Electrons
• Neutrons + Electrons
• Atoms
• Protons + Neutrons

A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture