what is the decreasing order of boiling point of alkaline earth metals?

Dear Zoya,

Alkaline earth metal	Standard atomic weight (u)[note 3][12][13]	Melting point (K)	Melting point (°C)	Boiling point (K)[6]	Boiling point (°C)[6]	Density (g/cm3)	Electronegativity (Pauling)	First ionisation energy (kJ·mol−1)	Covalent radius (pm)[14]	Flame test color
Beryllium	9.012182(3)	1560.15	1287.00	2742	2469	1.85	1.57	899.5	105	White[15]	40px
Magnesium	24.3050(6)	923.15	650.00	1363	1090	1.738	1.31	737.7	150	Brilliant white[1]	40px
Calcium	40.078(4)	1112.15	839.00	1757	1484	1.54	1.00	589.8	180	Brick-red[1]
Strontium	87.62(1)	1042.15	769.00	1655	1382	2.64	0.95	549.5	200	Crimson[1]
Barium	137.327(7)	1002.15	729.00	2170	1897	3.594	0.89	502.9	215	Apple green[1]	40px
Radium	[226][note 4]	973.15	700.00	2010	1737	5.5	0.9	509.3	221	Crimson red[citation needed]	40px

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