Question

1. Helium is the only gas which has 2 electrons in its valence shell.
2. 12c denotes that element carbon has mass number of 6 and atomic
number 12.
3. K-shell of an atom can accommodate maximum of eight electrons.
4. The number of neutrons in an atom of 7ci are 17.
5. Electronic configuration of all isotopes of an element is different.(true or false)​

Answer 1

Heyy bro heres ur answer hope it helps!

1. true, as out of elements with 2 electrons in the valence shell, only helium is a gas.

2. false, 12c represents that carbon has an atomic mass of 12

3. no, it can only withstand 2 electrons, as K shell is the first shell and the only orbital in it is 1s2

4. sorry, the 4th question is a little ambiguous

5. no, as isotopes have the same electronic configuration and the only thing which differs is the number of neutrons and not electrons.

buh bye hope it helps ;)