Question

which physical property of the alkali metal group decreases down the group​

Answer 1

Answer:

melting point and boiling point

Explanation:

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Answer 2

First ionisation energy, electronegativity and melting point decreases down the group.

Down the group number of shells increases. This causes increased distance between positively charged nucleus and negatively charged electrons. With increased distance, the bond also decreases in strength.

Hence, first ionisation energy, electronegativity and melting point decreases. Alkali metal group are group 1 elements. They have only one electron in their outermost shell.