Question

The elements Li, Na and K each having one valence electron, are in periods 2.3 and 4
respectively of modern periodic table. All of them have same valence electrons.
Compile the given information and answer the following questions:
(i) In which group of the periodic table should they be?
(ii) Which one of them is least reactive?
(iii) Which one of them has the largest atomic radius?​

Answer 1

Answer:

they belong to 1st group

2nd.. K is least reactive

3rd.. largest atomic number is K

Answer 2

Answer:

1) All these belong to 1st group

2) lithium is the least reactive out out of these elements

3) potassium has the largest atomic radius since size of atoms increase as we go down in a group.