First Semester Test Review--Part 2

Front

What is the atomic number of sodium (Na)?

Back

11 protons.

Front

What do elements represent in chemistry?

Back

Elements are pure substances that cannot be broken down into simpler substances and are represented by symbols.

Front

What is the relationship between elements and compounds?

Back

Elements are to symbols as compounds are to formulas.

Front

What orbits the nucleus of an atom?

Back

Electrons.

Front

What are the three main subatomic particles in an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What charge do electrons carry?

Back

Negative charge.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the nucleus of an atom?

Back

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