M2 PS Practice Test for EOC

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

What are protons?

Back

Protons are subatomic particles found in the nucleus of an atom that have a positive charge.

Front

What are neutrons?

Back

Neutrons are subatomic particles found in the nucleus of an atom that have no charge (neutral charge).

Front

What is the half-life of a substance?

Back

The half-life is the time required for half of the quantity of a radioactive substance to decay.

Front

How do you calculate the remaining amount of a substance after a certain number of half-lives?

Back

To calculate the remaining amount, divide the initial amount by 2 for each half-life that has passed.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is the difference between atomic number and atomic mass?

Back

The atomic number is the number of protons in an atom, while the atomic mass is the total number of protons and neutrons.

Front

What are isotopes?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

What is the structure of an atom?

Back

An atom consists of a nucleus containing protons and neutrons, surrounded by electron clouds.