• The periodic table is arranged into four blocks associated with the four sublevels—

s, p, d, and f.

• The periodic table consists of groups (vertical columns) and periods (horizontal

rows).

• The period number (n) is the outer energy level that is occupied by electrons.

• The number of the principal energy level and the number of the valence

electrons in an atom can be deduced from its position on the periodic table.

• The periodic table shows the positions of metals, non-metals and metalloids.

• Deduction of the electron configuration of an atom from the element’s position on the periodic table, and vice versa

• The terms alkali metals, halogens, noble gases, transition metals, lanthanoids and actinoids should be known.

• The group numbering scheme from group 1 to group 18, as recommended by IUPAC, should be used.