Question

explain why Alkaline earth metals show irregular melting and boiling point? in a paragraph
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Answer 1

Answer:

Physical and chemical behaviour

The alkaline-earth elements are highly metallic and are good conductors of electricity. They have a gray-white lustre when freshly cut but tarnish readily in air, particularly the heavier members of the group. Beryllium is sufficiently hard to scratch glass, but barium is only slightly harder than lead. The melting points (mp) and boiling points (bp) of the group are higher than those of the corresponding alkali metals; they vary in an irregular fashion, magnesium having the lowest (mp 650 °C [1,202 °F] and bp 1,090 °C [1,994 °F]) and beryllium the highest (mp 1,287 °C [2,349 °F] and bp about 2,471 °C [4,480 °F]). The elements crystallize in one or more of the three regular close-packed metallic crystal forms.

Answer 2

Answer:

Alkaline earth metals bear anomalous properties.

Explanation:

Alkaline earth metals are placed in group 2 of the periodic table and contain 6 elements. Elements of alkaline earth metals are Beryllium (Be) ,magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They have small size and are highly electropositive in nature. Consequently, they are solid and the crystal lattice is not packed uniformly. Due to this irregularity, they show anomalous trends in melting and boiling points.