What property do all elements in the same column of the periodic table as fluorine have in common ?

Which element has :

(a) two shells, both of which are completely filled with electrons ?

(b) the electron configuration 2, 8, 2 ?

(c) a total of three shells, with four electrons in its valence shell ?

(d) a total of two shells, with three electrons in its valence shell ?

(e) twice as many electrons in its second shell as in its first shell ?

What property do all elements in the same column of the periodic table as boron have in common ?

An atom has electronic configuration 2, 8, 7.

(a) What is the atomic number of this element ?

(b) To which of the following elements would it be chemically similar ? (Atomic numbers are given in parentheses)

N (7) F (9) P (15) Ar (18)

The positions of three elements A, B and C in the periodic table are shown below:

(a) State whether A is a metal or non-metal.

(b) State whether C is more reactive or less reactive than A.

(c) Will C be larger or smaller in size than B?

(d) Which type of ion, cation or anion, will be formed by element A ?