periodic table lore

Akali metals group 1

few metal behaviours, extremely reactive, soft

Alkaline earth metals group 2

high melting points, less reactive than group 1

Transition metals

temperature and malleability vary, less reactive than 1-2, can be found in nature as elements

Lanthanides and Actinides

rare earth metals, high diversity, radioactive

Post-transition metals

some transition metal properties, softer, conduct poorly

Metalloids

semiconductors, semi-metals, poor metals

Non-metals

bad conductors, brittle, dull, low temperatures

Metals

good conductors, malleable, lustrous, high temperatures

Halogens group 7

non-metal, react with metals to form salts, most reactive, exists as compounds, bigger/less reactive when moving down

Noble gases

inert, stable, colourless, odourless, natural in atmosphere, denser with descent

electronegativity

increases from left to right, decreases with descent

atomic number

number of protons, equal to number of electrons

atomic mass

mass of proton and neutron

relative atomic mass

average mass of isotopes of element

groups

vertical, valence electrons, reactive elements have fewer