[Ar]4s1 what’s the element name?

19

Explanation:

Here,

[Ar] = Argon = atomic no. = 18

4s1 = 1 electron

so 18 + 1 = 19

19 = Potassium (K)

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.