A compound has the formula H 2 Y (where, Y = non-metal) state the following Table A Table B (i) Electronic configuration ____________ (ii) Type of bonding ____________ (iii) Number of shared pair and lone pair ____________ (iv)Number of bonds in its molecule ____________

(i) The electronic configuration of Y can be 2 , 6 or 2 , 8 , 6 etc. (ii) In H 2 Y molecule, covalent bonding occur. (iii) Number of shared pair and lone pair of electrons is 4 and 2 . (iv) The number of bonds in its molecule is 2 . Table A Table B (i) Electronic configuration 2,6 or 2,8,6 (ii) Type of bonding covalent (iii) Number of shared pair and lone pair 4 and 2 (iv)Number of bonds in its molecule 2

Match the following columns. Column I (Nobles gases) Column II (Electronic configuration) (i) Helium (a) 2 , 8 (ii) Neon (b) 2 , 8 , 8 (iii) Argon (c) 2 (iv) Krypton (d) 2 , 8 , 8 , 18

(i) The electronic configuration of helium is 2 . Helium atoms have 2 electrons and the shell structure is 2 . (ii) The electronic configuration of neon is 2 , 8 . Neon has atomic number 10 , so a neon atom has 10 protons in its nucleus and therefore 10 electrons. (iii) The electronic configuration of argon is 2 , 8 , 8 . Atomic number of argon is 18 . (iv) The electronic configuration of krypton is 2 , 8 , 8 , 18 . Krypton is a chemical element with the symbol Kr and atomic number 36 . Column I (Nobles gases) Column II (Electronic configuration) (i) Helium (a) 2 (ii) Neon (b) 2 , 8 (iii) Argon (c) 2 , 8 , 8 (iv) Krypton (d) 2 , 8 , 8 , 18

What do you understand by a lone pair of electrons?

The pair of electrons that are left in the valence shell without forming covalent bonds are known as lone pairs of electrons. They affect the shape of the molecule and sometimes help in the formation of other molecules.

Give a reason for the following: Ionic compounds have a high melting point.

Ionic compounds have high melting point because, there is a strong electrostatic force of attraction between the oppositely charged ions, that is, there is a strong electrostatic force of attraction between the cation and the anion.

E M B I B E

All in One - ICSE Chemistry>Chapter 2 - Chemical Bonding>CHECK POINT 02>Q 1

EASY

10th ICSE

IMPORTANT

Earn 100

Show the formation of covalent bond using Lewis dot structure $N_{2}$ molecule.

Important Questions on Chemical Bonding

EASY

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 2 - Chemical Bonding>CHECK POINT 03>Q 4

Name the compound which contains all the three types of bonds.

EASY

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 2 - Chemical Bonding>CHAPTER EXERCISE>Q 4

For the formation of a covalent bond, both atoms should have _____ ionisation energy.(high/low)

EASY

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 2 - Chemical Bonding>CHAPTER EXERCISE>Q 7

A compound has the formula

H_{2} Y

(where,

Y =

non-metal) state the following

Table A	Table B
(i) Electronic configuration	____________
(ii) Type of bonding	____________
(iii) Number of shared pair and lone pair	____________
(iv)Number of bonds in its molecule	____________