Question

Name
(i) An alkali metal in period 3 and halogen in
period 2.
(b) The noble gas with 3 shells.
(c) The non-metals present in period 2 and metals in
period 3.
(d) The element of period 3 with valency 4.
(e) The element in period 3 which does not form oxide.
(f) The element of lower nuclear charge out of Be
and Mg.
​

Answer 1

Answer: i) Sodium is alkali metal and fluorine is halogen.

b)  Argon has three shells.

c) SOL: C, N, O and F are non-metals present in period 2 while Na, Mg and Al are metals in period 3.

d) Silicon . Its atomic number is 14

4. e) Argon

f) Both Be and Mg belong to the same group. The atomic number of Be is 4 whereas the atomic number of Mg is 12. Be has less number of electrons and it is smaller in size therefore, electrons will be strongly attracted towards the nucleus. Therefore, Be will have lower nuclear charge as compared to Mg

Explanation: hope its ok

Answer 2

Answer:

1) Argon

2) Boron, Magnesium

3) Silicon

4) Argon

5) Beryllium