Question

Compare the properties of elements in groups 17 and group 18. Make sure to cover the following points:

Answer 1

Answer:

Letter: C

explanation:

:)

Answer 2

Answer:

a) Explain why:

(i) All the elements of a group have similar chemical properties.

(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm, 104 pm and 143 pm respectively. Giving a reason arrange these elements in the increasing order of atomic number in the period.