(a) How does chemical reactivity of metals and non-metals vary on going down in a group?

(b) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(c) Amongst lithium and potassium, which is larger in size and why?

Asked by Topperlearning User | 28th May, 2014, 08:34: AM

Expert Answer:

(a) Chemical reactivity of metals increases on going down in a group and chemical reactivity of non-metals decreases on going down in a group.               

(b) It is not possible to have an element with atomic number 1.5 because atomic number is the number of protons in an atom which is always a simple whole number (it can be either 1 or 2 but not 1.5).                            

(c) Potassium is larger in size than lithium because as we move down the group, the atomic size of the element increases.                                 

Answered by  | 28th May, 2014, 10:34: AM

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