Atoms

Front 1

Electronegativity

Back 1

measures how strongly an atom draws electrons to it.

Front 2

Covalent bonding

Back 2

occurs between the atoms of non-metals and involves a sharing ofelectrons so that the orbitals of the outermost energy levels in the atoms are filled.

Front 3

chemical bond

Back 3

the physical process that causes atoms and molecules to be attractedtogether and to be bound in new compounds.

Front 4

valency

Back 4

the number of bonds an atom can form with other atoms

Front 5

atomic number

Back 5

the number of protons in an atom

Front 6

isotope

Back 6

made up of atoms which have the same numberof protons as the atoms in the original element, but a different number of neutrons. Thismeans that not all atoms of an element will have the same atomic mass.

Front 7

atomic mass number

Back 7

the number of protons and neutrons in the nucleus ofan atom

Front 8

valence electrons

Back 8

electrons in the outermost energy level

Front 9

ionisation energy

Back 9

the energy that is needed to remove one electron froman atom

• Ionisation energy increases across a period in the Periodic Table.

• Ionisation energy decreases down a group in the Periodic Table

Front 10

reactivity of the elements decreases

diameter of atoms decreases

Back 10

from left to right across a period.