Biology Chemistry of Life

Each element of the periodic table is composed of how many atoms?

• 1

• 2

• 3

What subatomic particles are found in the nucleus and have a positive charge?

• protons

• electrons

• neutrons

What subatomic particles are found in energy levels outside of the nucleus and have a negative charge?

• protons

• neutrons

• electrons

What subatomic particles found in the nucleus have no charge?

• protons

• neutrons

• electrons

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-8

Each element is neutral in charge because they have an equal amount of protons and electrons.

• True

• False

Tags

NGSS.HS-PS1-7

The atomic mass of an element is equal to

• the number of protons and electrons

• the number of protons and neutrons

• the number of electrons and neutrons

The atomic number is equal to the number of

• protons

• electrons

• neutrons

To identify the number of neutrons in the nucleus of an atom, subtract the atomic number from the atomic mass.

• True

• False

An isotope is defined as an element that has a different number of neutrons.

• True

• False

A substance formed by two or more different elements defines a/an

• mixture

• molecule

• compound