Unit 3 Test B

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals. They can conduct electricity under certain conditions.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

How many protons are in an atom of phosphorus?

Back

An atom of phosphorus has 15 protons.

Front

What is the maximum number of valence electrons an atom can have?

Back

The maximum number of valence electrons an atom can have is 8.

Front

How many electrons are in a neutral atom of sodium?

Back

A neutral atom of sodium has 11 electrons.

Front

What is the definition of a proton?

Back

A proton is a positively charged particle found in the nucleus of an atom.

Front

What is the definition of a neutron?

Back

A neutron is a neutral particle found in the nucleus of an atom.

Front

What is the definition of an electron?

Back

An electron is a negatively charged particle that orbits the nucleus of an atom.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a valence electron?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.