Question

be, mg, ca, sr arrange in decreasing boiling point​

Answer 1

Be < Mg < Ca < Sr

Explanation:

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.