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.
The starting substances in a chemical reaction are called reactants - they are written on the left side of a chemical equation.
I think 3 of them are its been 1 half years since ive done this i dont take chemistry anymore
