Question

The electronic configuration of some elements are given below. a. 2,8,8,1 b. 2,4 c. 2,8,7 d. 2,8,8 a. Which among the above usually does not take part in chemical reaction? b. Which pair of elements may form a covalent bond? ​

Answer 1

Answer:

a). The element with the electronic configuration 2,8,8 will usually doesn't take part in reaction because it's the Nobel gas configuration.

b). Elements (b) may form a covalent bond by sharing its electron.

Answer 2

Answer:

The element with electronic configuration 2, 8, 8  usually does not take part in chemical reaction. The element with electronic configuration 2, 4 (carbon) and 2,8,7 (Cl) may form a covalent bond.

Explanation:

• If the valence shell of an element is completely filled. Then it will not  participate in chemical reactions. For example the noble gases. Therefore, the option (d) 2, 8, 8 has electronic configuration of a noble gas (Ar).
• The electronic configuration 2, 8 ,8,1 has configuration of alkali metals (K). The alkali metals are electropositive in nature. It will participate in the formation of ionic bond.
• The option (c) has electronic configuration 2, 4 belongs to carbon. Carbon has partially filled valence shell. So it will form the covalent bond  by mutual sharing of electrons with chlorine has configuration 2, 8, 7. The both chlorine and carbon are non-metals. For example, the compound CCl₄ has carbon and chlorine covalent bond.