Calcium is an element with atomic number 20. Is it a metal or a non – metal? Is it more reactive than Mg or less reactive? What will be its valency? What would be the formula of its chloride? Will it be larger than K or smaller?
Answers
Answer:
The atomic no. of calcium is 20.
Electronic configuration =2,8,8,2
The valence electrons in calcium are 2. Thus it is a metal of group 2.
The valency of calcium is +2 as it has 2 valence electrons.
The chloride of calcium is CaCl
2
as the valency of chloride ion is −1 and that of calcium is +2.
It is smaller than K as both elements lie in the third period of the periodic table but K lies to the left of Ca in the period and we know that atomic size decreases as move right in a period
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The atomic no. of calcium is 20.
Electronic configuration =2,8,8,2
The valence electrons in calcium are 2. Thus it is a metal of group 2.
The valency of calcium is +2 as it has 2 valence electrons.
The chloride of calcium is CaCl
2
as the valency of chloride ion is −1 and that of calcium is +2.
It is smaller than K as both elements lie in the third period of the periodic table but K lies to the left of Ca in the period and we know that atomic size decreases as move right in a period.
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