Define 'Cation'

• bonds that occur when a non-metal reacts with another non-metal

• the rows on the periodic table

• atoms that have unequal numbers of protons and electrons and therefore are no longer neutral.

• an atom that has lost an electron, changing from neutral to positively charged

'Valence electrons' are defined as

• the electrons in an atom’s outermost level or shell

• a pure chemical substance consisting of two or more different chemical elements

• groups of atoms held together by strong bonds.

• the charge of an ion i.e. the number of electrons the atom has gained or lost to become an ion

An 'atom' is

• the charge of an ion i.e. the number of electrons the atom has gained or lost to become an ion

• a pure substance that cannot be broken down into other substances

• the smallest particle of a chemical element that can exist

• bonds that occur when a metal reacts with a non-metal

A 'chemical reaction' is defined as

• atoms that have unequal numbers of protons and electrons and therefore are no longer neutral.

• the process in which one or more substances, the reactants, are converted to one or more different substances, the products.

• an atom that has lost an electron, changing from neutral to positively charged

• the electrons in an atom’s outermost level or shell

'Periods' are

• the rows on the periodic table

• the electrons in an atom’s outermost level or shell

• the columns on the periodic table

• pure substance that cannot be broken down into other substances

An 'Element' is

• the rows on the periodic table

• an atom that has lost an electron, changing from neutral to positively charged

• the charge of an ion i.e. the number of electrons the atom has gained or lost to become an ion

• a pure substance that cannot be broken down into other substances

Define a 'molecule'

• bonds that occur when a non-metal reacts with another non-metal

• groups of atoms held together by strong bonds.

• bonds that occur when a metal reacts with a non-metal

• the smallest particle of a chemical element that can exist

The definition of a 'compound' is

• a pure chemical substance consisting of two or more different chemical elements

• atoms that have unequal numbers of protons and electrons and therefore are no longer neutral.

• pure substance that cannot be broken down into other substances

• an atom that has lost an electron, changing from neutral to positively charged

A 'Group' is

• the rows on the periodic table

• the columns on the periodic table

• bonds that occur when a metal reacts with a non-metal

An 'Anion' is defined as

• an atom that has lost an electron, changing from neutral to positively charged

• groups of atoms held together by strong bonds.

• bonds that occur when a metal reacts with a non-metal

• an atom that has gained an electron, changing from neutral to negatively charged