Question

What is mean of perodic table velancy

Answer 1

Answer:

periodic table valancy means no. of electron are present in outer cell of an element

it written there to distinguish between element and also know there basicity,charge,metal,or nonmetal. etc

hope this answer useful to you and pls make me brainlist pls

Answer 2

it is because of showing

some atomic like sulphur iron aluminium and many more to react with each other and form some other gases