Review

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

The subatomic particles that make up an atom.

• solid, liquid, gas

• electrons, protons, nucleus

• energy, protons, nucleus

• electrons, protons, neutrons

__________ are negatively charged particles that are in the orbitals around the nucleus.

• protons

• nucleus

• neutrons

• electrons

A proton has a ___________ charge.

• positive

• negative

• neutral

• massive.

An electron has a _________ charge

• positive

• neutral

• negative

• massive

Which is an electron?

• A
• B
• C

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

• 10
• 20
• 30

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

• 22
• 11
• 34
• 23