Atomic Structure and Molecules

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

• electron

• neutron

• proton

• photon

Which subatomic particle has a negative charge and orbits around the nucleus of an atom?

• electron

• photon

• neutron

• proton

What is the total number of protons and neutrons in the nucleus of an atom called?

• mass number

• valence number

• atomic number

• electron number

How many electrons can the first energy level of an atom hold?

• 2

• 8

• 6

• 4

What is the term for the electrons in the outermost energy level of an atom?

• nucleus electrons

• core electrons

• inner electrons

• valence electrons

What is the name of the law that states that a chemical compound always contains the same elements in the same proportion by mass?

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Conservation of Mass

• Law of Variable Proportions

What is the smallest unit of a chemical element that retains its chemical properties?

• ion

• compound

• atom

• molecule

Which subatomic particle has no charge and is located in the nucleus of an atom?

• proton

• electron

• positron

• neutron

What is the term for the number of protons in the nucleus of an atom?

• nuclear charge

• atomic number

• atomic mass

• electron number

What is the term for the number of protons plus neutrons in the nucleus of an atom?

• electron number

• atomic number

• charge number

• mass number