iGCSE Topic 1c Atomic Structure DOUBLE REVISION MCT

Front

What is the mass number of an atom?

Back

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

Front

Define an atom.

Back

An atom is the smallest part of an element that can still be recognized as that element.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge.

Front

How many protons are in a Helium atom?

Back

A Helium atom has 2 protons.

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 is the charge of a proton?

Back

A proton has a positive charge.

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 the difference between an atom and a molecule?

Back

An atom is a single unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the role of electrons in an atom?

Back

Electrons are responsible for chemical bonding and reactions, as they occupy energy levels around the nucleus.