U7 Bellwork-PS

What two particles make up the nucleus of an atom?

• protons and electrons
• neutrons and protons
• protons only
• electrons and neutrons

What is the charge of a proton?

• positive (+)
• negative (-)
• neutral (0)

What is the charge of a neutron?

• positive (+)
• negative (-)
• neutral (0)

What is the charge of a electron?

• positive (+)
• negative (-)
• neutral (0)

Atoms are surrounded by shells of _______.

• protons
• electrons
• neutrons

How many protons are in Be?

• 2
• 4
• 5
• 8

How many neutrons are in Be?

• 2
• 4
• 5
• 8

How many electrons are in Be?

• 2
• 4
• 5
• 8