Modern Atomic Theory

The closer an electron is to the nucleus, the higher its energy.

• True

• False

The region around the nucleus occupied by the electrons is called the proton​ cloud.

• True

• False

The maximum number of electrons in the second energy level of an atom is 4.

• True

• False

In 1926, scientists developed the electron cloud model of the atom that is in use today.

• True

• False

According to present atomic theory, the location of an electron in an atom cannot be pinpointed exactly.

• True

• False

When electrons release energy, some of the energy may be released as visible light. ​

• True

• False

Tags

NGSS.HS-PS4-3

An electron's excited state is ​more​ stable than its ground state.

• True

• False

An atom of calcium has _____ protons.

• 2

• 20

• 40

Tags

NGSS.MS-PS1-1

An atom of calcium has _____ neutrons.

• 2

• 20

• 40

Tags

NGSS.HS-PS1-8

How many electrons are in the first energy level of a calcium atom?

• 2

• 8

• 18