It would be A) Cl, K, Ar
Because Cl=35,K=39,Ar=40
answer is A
The kinetic theory is used to explain the behaviour of gases.
One of the assumptions states that "a gas is composed of a large number of identical molecules moving at different speeds".
When magnesium ion doesn't give any characteristics colour with the flame test as electronic transisitons do not give out visible light.
Answer is: CH4 and NaCI hope this helps you
