Calcium is an element with atomic number 20 (i) Will it be a metal or non-metal? (ii) What will be its valency?

(i) Ca is metal because it contains 2 valence electrons. The electronic configuration of calcium is 2,8,8,2. The valence electrons in calcium are 2. Thus it is a metal belonging to group 2. (ii) The valency of calcium is +2 as it has 2 valence electrons.

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