Question

Which element is more reactive. The one with atomic no. 18 or with atomic no. 19 give reasons

Answer 1

Answer: The atom with atomic number 19 is more reactive than the element with atomic number 18. This is bcoz we know that the element with atomic number 18 has the electronic configuration of 2,8,8 which means that it's octet is complete. Hence, it is stable whereas the element with atomic number 19 has an electronic configuration of 2,8,8,1. So, to become stable, it will lose 1 electron. Hence, the element with atomic number 19 is more reactive than the element with atomic number 18.

Hope it helped :--)

Plz mark BRAINLIEST ✌

Answer 2

Answer: atomic number 19

Explanation: atomic number 18 is Argon it is inert gas and atomic number 19 is potassium it is metal more reactive