Question

43.
Melting and boiling points gradually __________
in a periodic table from left to
right up to the middle.
(a) Increases (b) Decreases
(c) Remains constant (d) none of these​

Answer 1

a) increases

Hope this helps.

Answer 2

Concept Introduction:

In the periodic table, on crossing a period the atomic size of the element is decreased and the atomic size is increased by descending of groups. So we can see, the melting and boiling point of the group 1 elements decrease on descending the group. This actually happens due to decreasing of force of attraction between the atoms.

Explanation:

We have been given a question and there is a blank space in which we have to put the correct option.

We have to find the correct answer from these given options.

Final Answer:

Option (a) Increases.

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