Question

3. Explain why are the following statements not correct:
() All groups contain metals and non metals.
(ii) Atoms of elements in the same group have the
same number of electron(s).
(iii) Non-metallic character decreases across a period
with increase in atomic number.
iv) Reactivity increases with atomic number in a group
as well as in a period.​

Answer 1

Answer:

1) ALL GROUPS CONTAINS METALS AND NON METALS

Correction :

S Block elements are all metals

P block elements are METALS metalloids and non metals

D block elements are all METALS

2) Atoms of elements in the same group have the same number of valence electrons

Example: Na = 11 , K=19

3) Metallic character increases across the period when the atomic number increases

Explanation:

4)Reactivity does not depend upon atomic number

Answer 2

Answer:

1. S block and D block are metals P block is metals non metal and metalloids

2. Atoms of elements in the same group have the same number of valence electrons

3. metallic character increases across a period with increase in atomic number

4. Reactivity does not depend on the atomic number

Explanation:

I hope it's clear for u