A 8-9 2024-2025 Atomic Structure Pre-Assessment

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is atomic mass defined as?

Back

Atomic mass is defined as the total number of protons and neutrons in an atom's nucleus.

Front

Which particle determines the identity of an element?

Back

The proton determines the identity of an element.

Front

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

Back

Number of neutrons = Atomic mass - Atomic number.

Front

If an atom has 10 protons, how many electrons does it have if it is neutral?

Back

If the atom is neutral, it has 10 electrons.

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 nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What is an isotope?

Back

An isotope is a variant of an element that has the same number of protons but a different number of neutrons.