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

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

The mean mass of an atom relative to 1/12th of the mass of a carbon-12 atom.

Atomic number and mass number

Combined science

Atomic structure (negligible electron mass)

Developing a model for atoms

Atoms, elements and compounds

Modern periodic table and electron configuration

Isotopes and relative atomic mass

Relative formula mass

Development of the periodic table

In the Structure and Bonding unit, pupils will build on their understanding of atomic structure to explore different types of chemical bonding and how these bonds affect the properties of substances.

In the Atoms, Elements and Compounds unit, pupils learned about the differences between atoms, elements, and compounds, as well as their chemical symbols and formulae.

This unit covers the atomic model, relative atomic mass, isotopes, and the structure of the modern periodic table. It explains how atomic structure influences element positioning, properties, and reactivity. The focus is on identifying trends and using models to develop scientific explanations.

Atomic structure and the periodic table

the number of electrons in a neutral atom

What does the atomic number of an element indicate?

True or false? The atomic number is equal to the number of electrons in a neutral atom.

the mean mass of an atom relative to 1/12th of the mass of a carbon-12 atom

the total number of protons and neutrons in the nucleus of an atom

If an atom has an atomic number of 6, how many electrons does it have?

mass number includes protons and neutrons

How does the mass number differ from the atomic number?

An element has a mass number of 23 and an atomic number of 11. How many neutrons does it have?

On the periodic table, what does the number 9 represent for the element fluorine?

Match the element to its correct atomic number.

Which of the following elements are in Group 3?

The element with the atomic number 26 is known for its use in construction due to its strength and low density. What is this element?

Give the name, or symbol, of an element in the first period on the periodic table.

The position of an element in the periodic table is linked to its arrangement of electrons and to its atomic number.

Atomic number and mass number

Lesson outcome