Periodic Table & Trends

The repeating trend of physical and chemical properties across the periods of the table.

The ability of an atom to attract a shared pair of electrons in a covalent bond.

Energy required to remove one mole of electrons from one mole of gaseous atoms.

Half the distance between the nuclei of two identical atoms bonded together.

The radius of an atom's ion in an ionic crystal lattice.

The net positive charge experienced by valence electrons after shielding is accounted for.

The energy change when one mole of electrons is added to one mole of gaseous atoms.

A vertical column in the periodic table; elements share the same number of valence electrons.

A horizontal row in the periodic table; elements share the same number of occupied energy levels.

Group 18 elements with a full outer shell, characterized by chemical inertness.

Group 1 highly reactive metals that form basic oxides and $+1$ ions.

Group 17 reactive non-metals that form acidic compounds and $-1$ ions.

A substance that can act as both an acid and a base ($e.g. Al_2O_3$).

A compound formed between oxygen and another element.

The similarity in properties between elements diagonally adjacent in the periodic table ($e.g. Li ext{ and } Mg$).