Chemistry Year 10

Across: number of electron shells

Down: number of valence electrons

Atoms of the same element, different number of neutrons in the nucleus

Alkali metals

Alkali earth metals

Halogens

Noble gases

Number of protons and neutrons

Number of Protons

-Solid at room temperature -Polished to produce a high shine/lustre -Good conductors of electricity -Malleable -Can be made into a wire; ductile -Usually melt at high temperatures (mercury is the exception)

-Cannot be polished to produce a shine -Brittle; shatter when hit -Cannot be bent into shape; not malleable -Usually, poor conductors of electricity and heat -Usually melt at low temperatures -Many are gases at room temperatures

2n^2

Lowest energy state of an atom

Highest energy state of an atom

Cations

Anions

The attraction between two oppositely charged bodies

-Usually solids at room temperature -Normally very high melting points, because electrostatic attraction is very strong -Usually dissolve in water to form aqueous solutions -Their aqueous solutions normally conduct electricity

A shared pair of electrons holding two atoms together

Place elements in decreasing order of reactivity

Solution in which water is the solvent

Solid product of a chemical reaction that is insoluble in water

A number that compares the mass of atoms to an agreed mass of carbon-12 isotope

All react strongly with water to form basic (alkaline) solutions, very reactive metals