Chemistry Unit Test

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

How is the periodic table organized?

Back

The periodic table is organized by increasing atomic number.

Front

What is density and how is it measured?

Back

Density is the mass of a substance divided by its volume, measured in g/mL.

Front

What changes in an atom when it becomes an ion?

Back

When an atom becomes an ion, the number of electrons changes.

Front

What does the atomic mass represent?

Back

The atomic mass represents the average mass of an atom of an element, measured in atomic mass units (amu).

Front

What is the significance of neutrons in an atom?

Back

Neutrons contribute to the atomic mass and stability of the nucleus but do not affect the charge of the atom.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.

Front

What is the difference between atomic number and atomic mass?

Back

Atomic number is the number of protons, while atomic mass is the weighted average mass of an element's isotopes.

Front

How do you determine the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.