is an energy level outside the nucleus which contains electrons.

of an atom of an element describes how the electrons are arranged in shells.

is a horizontal row on the periodic table, it corresponds to the number of shells of an atom in an element that have electrons in them.

is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.

Modern periodic table and electron configuration

Chemistry

In the Calculations involving mass unit, pupils will learn about calculating the relative formula mass of reactants and products in balanced chemical reactions, and the conservation of atoms and mass, as well as the concept of moles (HT only).

In the Patterns in the periodic table unit, pupils learnt how the chemical and physical properties of different elements are indicated by their position on the periodic table and about key groups of elements. 

Atomic structure and the periodic table

Which group in the periodic table contains elements with a full outer electron shell?

How many electrons can the first shell of an atom hold (maximum)?

The elements are ordered by increasing atomic mass.

Position of an element provides information about its electron configuration.

Which of the following statements about the periodic table is FALSE?

Identify the group number for elements with electronic configuration ending in 2,7.

Write the electron configuration of calcium (separate each number by a comma ",")

Write the element's symbol below for the element represented in this electron configuration diagram.

Which of these subatomic particles are located in shells around the nucleus of an atom?

How many protons does an atom of carbon have?

An atom has 12 protons and 12 neutrons. What is its mass number?

True or false? You can find out how many electrons are in a neutral atom of each element by looking at the periodic table.

An element has 16 electrons. Based on its electronic arrangement, determine whether it is more likely to be a metal or a non-metal.

Dalton's solid sphere model where atoms were indivisible particles.

Thomson's plum pudding model where electrons were embedded in a positive sphere.

Rutherford's model with a nucleus and electrons orbiting like planets.

Bohr's model with electrons in fixed orbits or energy levels.

Place the following models of the atom in chronological order based on their development, starting from the earliest to the latest:

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