Question

Which of the following will not represent Dobereiner's triad? *
1.Li, Na, K
2.Be, Mg, Ca
3.Cl, Br, I
4.N, P, As

Choose the correct answer other wise I will report​

Answer 1

Answer:

So if there are any of the two elements in the group that has a very low and very high atomic mass number, then these elements do not exhibit Doberiner traits. Li (7) , Na (23) , K (39) = Li + K = 7 + 39 = 46 / 2 = 23 = Na (middle element) so this is a Dobereiner traits.