Explain the bonding in methane molecule using electron dot structure.

An element L consists of molecules.

(i) What type of bonding is present in the particles that make up L?

(ii) When L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?

Elements — W, X, Y & Z have electronic configurations:
W = 2,8,1
X = 2,8,7
Y = 2,5
Z = 1

(i) What type of bond is formed between:
    (a) W and X
    (b) Y and Z

(ii) What is the formula of the compound formed between :
    (a) X and Z
    (b) W and X

Draw an electron dot diagram to show the formation of ammonium ion [N = 7, H = 1]