(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?
(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.
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