A 3-4 2024-2025 Atomic Structure Pre-Assessment

Front

What is the atomic number of an atom?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the atomic mass of an atom?

Back

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

Front

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

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What particle determines the identity of an element?

Back

The proton determines the identity of an element.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the valence shell?

Back

The valence shell is the outermost shell of an atom that contains electrons.