Question

The physical and chemical properties of elements belonging to the same group are similar,

why?

3. Hydrogen should be placed in which group and which period? Give reasons.

4. In each of the given pairs, choose which element will have the bigger atom. Give reasons for

your choice.

(a) Mg (atomic number 12) or Cl (atomic number 17)

(b) Na (atomic number 11) or K (atomic number 19)

5. The atomic numbers of three elements A, B and C are 5, 7 and 10 respectively. Which two of

these will have similar properties? Give reasons.​

Answer 1

Answer:

for 3rd one

hydrogen should be placed in middle of the periodic table because it's properties are similar to both 1group and 7th group

4:(a)mg will have bigger atom

(b) na will have bigger atom

5: b,c are almost similar properties