calcium is an element with atomic number 20. a) is it a metal or non metal? b) is it more reactive than magnesium or less? c) what will be the formula of its chloride? d) what will be its valency? e) will it be smaller than potassium or larger?
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a) calcium is metal
b) calcium is more reactive than magnesium as calcium comes before magnesium in reactivity series (see attachment 1 for reactivity series)
C) the formula for calcium chloride is cacl2 (see attachment 2 for the formula)
d) the valency of calcium is 2+ (see attachment 3 for how to get the valency)
e) calcium will be smaller than potassium (see attachment 4 for why calcium is smaller that potassium)
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