Atomic Structure

A column in the periodic table is known as a

• Row

• Period

• Group

What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.

• cell

• nucleus

• atom

• electron

What is a subatomic particle with a positive charge that is in the nucleus of an atom?

• neutron

• proton

• electron

• valence electron

What is a subatomic particle without an electric charge, located in the nucleus of an atom?

• neutron

• proton

• electron

• valence electron

What is the center of an atom containing protons and neutrons?

• nucleus

• neutron

• proton

• electron cloud

What is the number of protons in the nucleus of an atom that determines the chemical properties of an atom?

• mass number

• atomic mass

• atomic number

• atomic symbol

Subatomic particle with a charge of 0

• neutron
• proton
• electron
• quark

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

The number 16 for the atomic element sulfur is the

• ionic number

• isotope

• atomic mass

• atomic number

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined