Question

Elements having electronic configuration as 1s2 are
1) alkaline earth metals
2) inert gas
3) inner transition metal
4) Transition metal​

Answer 1

Answer:

(1) alkaline earth metals

Answer 2

Inert gases beacuse 1s2 is the electronic configuration of Helium gas that is stable and knows as Noble gas or Inert gases, it does not take part in any reaction, these type of gases are completely stable and has made their octet or duplet (in case of helium), they are present in the 18th group in the periodic table.

Some examples of noble gases or inert gases is,

Helium, Neon, Argon, Krypton, Radon, Xenon etc.

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