Slides in this set
Different Substances and Their Properties
Chemical Calculations (Both Tiers)
Chemical Calculations (Higher)
Rates of Reaction
Energy Changes and Reversible Reactions
Reversible Reactions (Higher)
Acids, Bases and Salts…read more
Atoms consist of electrons surrounding a nucleus that contains
protons and neutrons.
Neutrons are neutral, but protons and electrons are electrically
Protons have a relative charge of +1, while electrons have a relative
charge of -1.
The number of protons in an atom is called its atomic number.
In the periodic table atoms are arranged in atomic number order.
Electrons are arranged in energy levels or shells, and different energy
levels can hold different numbers of electrons.
The electronic structure of an atom is a description of how the
electrons are arranged, which can be shown in a diagram or by
There is a link between the position of an element in the periodic table
and its electronic structure.…read more
Although the word 'atom' comes from the Greek for
indivisible, we now know that atoms are not the smallest
particles of matter.
Atoms are made from smaller subatomic particles.
At the centre of an
atom is a nucleus
containing protons and
Electrons are arranged
around the nucleus in
energy levels or shells.…read more