The atomic number of an element is 20. Write its electronic configuration. State whether this element is a metal or a non-metal. What is its valency? Write the name and formula of the compound whch this element forms with chlorine.

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Solution

Atomic number of Calcium is 20 and its electronic Configuration is 2,8,8,2.

Since it has only two valence electrons, it is present in group 2. Therefore, it is a group 2 element which are also known as alkaline earth metals. Hence, calcium is a metal. and valency of calcium is 2.

Name of the compound is Calcium chloride and chemical formula is ${CaCl}_{2}$ .

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