Question

26. State how density and melting points of elements varies across a period and down the group​

Answer 1

Answer:

Density, in general, increases with increase in atomic number. As such density increases as we move down a group from top to bottom. Trend in melting point is different for metals and non-metals as is clear from the change in melting point in Group I or Group 2 (groups which contain only metals), and Group 17 or Group 18 (groups which contain only non-metals). In groups which contain . only metals, m.p. decreases down the group while in groups which contain only non-metals, m.p. increases down the group. Thus in group I, m.p. is in the order ; Li > Na > K > Rb > Cs while in Group 17, m.p. is in the order: F2>Cl2

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Answer 2

Explanation:

Density, in general, increases with increase in atomic number. As such density increases as we move down a group from top to bottom. Trend in melting point is different for metals and non-metals as is clear from the change in melting point in Group I or Group 2 (groups which contain only metals), and Group 17 or Group 18 (groups which contain only non-metals). In groups which contain . only metals, m.p. decreases down the group while in groups which contain only non-metals, m.p. increases down the group. Thus in group I, m.p. is in the order ; Li > Na > K > Rb > Cs while in Group 17, m.p. is in the order: F2>Cl2.