The Periodic Table Vertical columns in the periodic

The Periodic Table Vertical columns in the periodic table are called groups/periods. Horizontal rows in the table are called groups/periods. Elements are arranged in order of their atomic/mass number. More/less than three quarters of elements are metals/non-metals. Fewer than one quarter of the elements are metals/non-metals. · Metals/non-metals are found on the left and in the middle. Metals/non-metals are found on the right hand side of the table.

The Alkali Metals Alkali metals are in group 1 / group 2 of the periodic table. Alkali metals have low/high density. Some are less dense than water and so they float/sink. Alkali metals react with non-metals to form ionic/covalent compounds. The metal ions carry a charge of plus/minus one. The compounds are white/black solids which dissolve in water to form colourless solutions. Alkali metals react with water to release Oxygen/Hydrogen. Alkali metals form hydroxides which dissolve in water to give solutions that are alkaline/acidic.

Elements in Group 7 and Group 0 Have typical properties of metals/nonmetals Low/high melting points and boiling points Strong/brittle when solid Poor/good conductors of heat and electricity

Elements in Group 7 Halogens Have coloured/non-coloured vapours Molecules made up from atom pairs/single atoms Form covalent molecules/ionic salts Form covalent/ionic compounds with other nonmetallic elements

Elements in Group 0 Noble gases Chemically very reactive/unreactive Exist as single/diatomic atoms Used as inert/reactive gases in filament lamps and discharge tubes

Transition Metals The block of transition metals are found on the left/in the centre of the table Good/Bad conductors of heat and electricity Can hardly/easily be bent or hammered into shape

Transition Metals Compared with Alkali Metals High/low melting points Weak/hard, tough/soft and strong/weak Much more/less reactive React (corrode) quickly/slowly with oxygen and/or water

Transition Metals other properties Mainly form white/coloured compounds as in pottery glazes Many transition metals, like Iron and Aluminium, are used/not used as catalysts