Question

6. Arrange the following in order of decreasing boiling point : Be, Mg, Ca, Sr​

Answer 1

Explanation:

Sr ,ca,mg,be

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Answer 2

Order of decreasing boiling point of the given elements is as follows.

                          Sr < Ca < Mg < Be

Explanation:

boiling point is the temperature at which vapor pressure of a liquid becomes equal to the atmospheric pressure.

More is the atomic size of an atom more will be its boiling point. This is because more is the surface area of an atom more will be the heat energy required by it to change it to change its phase.

When we move down a group then there occurs an increase in atomic size of the atoms. For example, group 2 elements are Be, Mg, Ca, Sr​ .

Their atomic size increases in the order Be < Mg < Ca < Sr. Therefore, their boiling point will increase in the same order as their atomic size.

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