Question

atomic number 20 identify the element identify the group number identify the period of this element what would be the electronic configuration determine the valency of this element​

Answer 1

Required Answers:-

The atomic number of an element is 20.

• Name of the element:- Calcium

• Electronic Configuration:- 2, 8, 8, 2

• Group:- Since the outermost shell of the element has 2 electrons, it means the element belongs to the 2nd group in the periodic table.

• Period:- Since the element has 4 orbits, it means the element belongs to the 4th period in the periodic table.

• Valency:- The outermost shell of the element has 2 electrons. Hence the valency of the element is 2.

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Extra Information!!

• The elements of each group consist of equal number of electrons in the valence shell. (For example:- Hydrogen and Lithium belong to 1st group and both of these elements have same number of valence electrons i.e. 1).

• The elements of each period consist of equal number of orbits. (For example:- Potassium and Calcium both of these elements belong to 4th period and both of these have same number of orbits i.e. 4)

• The number of group signifies the number of valence electrons. For example:- Chlorine belongs to 17th group and has 7 valence electrons.

• The number of period signifies the number of orbits of the element. For example:- Magnesium belongs to 3rd period and had 3 orbits.

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