8th Grade Science Fall Benchmark Review

Front

What are valence electrons?

Back

The number of electrons in the outermost shell.

Front

How many protons does this atom have?

Back

5

Front

What is the definition of physical change?

Back

Changes affecting the form of a chemical substance, but not its chemical composition.

Front

What part of the atom determines the identity of an atom?

Back

Protons.

Front

What is chemical change?

Back

When two chemicals react with one another to form a new substance.

Front

What is an atom?

Back

The basic unit of a chemical element.

Front

What is the nucleus of an atom?

Back

The central part of an atom, containing protons and neutrons.

Front

What are neutrons?

Back

Neutral particles in the nucleus of an atom.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition, while a chemical change results in new substances.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.