Question

The electronic configuration of an element is 2, 8, 4. State its-
a. group and period in the modern periodic table
b. name and write its one physical property

Answer 1

group is 14 th(valence electrons)

and period is 3(no of shells)

silicon

it is a metalloid

melting point 1410°C

Answer 2

The electronic configuration of an element is 2, 8, 4. Its-

a. group is 14 and period is third in the modern periodic table

b. name of the element is silicon and its one physical property is that its melting point is $1414^{o}C$.

Explanation:

• According to the given electronic configuration there are total 14 electrons present in the element. As the number of electrons is equal to the number of protons in a neutral atom. So, an element with atomic number 14 is silicon.

• As there are 4 valence electrons present in it. Hence, it is a group 14 element and it lies in period 3 of the periodic table. Physical property is the property which does not bring any change in chemical composition of the substance.

• For example, boiling point, volume, density etc are all physical properties. So, one physical property of silicon is that its melting point is $1414^{o}C$.

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