Unit 3 Test Review- Chem

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

• nucleus 

• electron cloud

• core 

• center 

An atom with atomic number 6 would have how many protons 

• 6

• 12

• 3

• cannot be determined 

True or False? Neutrons have a negative charge

• True

• False

What is the atomic number for an element with three protons?

• 2

• 1

• 3

• 6

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

• 14

• 7

• 15

• 18

The positive particles of an atom are 

• electrons 

• positrons 

• neutrons 

• protons 

all matter is made of what 

• energy 

• atoms 

• electrons 

• compounds 

electrons have this type of charge?

• negative

• positive

• neutral

Most of the mass in an atom is concentrated in the...

• electrons

• nucleus

• protons

• empty space

What does the nucleus consist of?

• Protons + Electrons

• Neutrons + Electrons

• Atoms

• Protons + Neutrons