Fill in the blanks in the following sentences:
(i) Two atoms of the same element combine to form a molecule. The bond between them is known as .. bond.
(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as....
(iii) In the formation of an oxygen molecule, ... electrons are shared by each atom of oxygen.
(iv) In the formation of a $N_{2}$ molecule, ... electrons are shared by each atom on nitrogen.
(v) The number of single covalent bonds in $C_{2} H_{2}$ molecule are....
(vi) Melting points and boiling points of ionic compounds are generally ... Than those of covalent compounds.

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Solution

(i) Two atoms of the same elements combine to form a molecule. The bond between them is known as a covalent bond.

(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as a covalent bond.

(iii) In the formation of an oxygen molecule, two electrons are shared by each atom of oxygen.

(iv) In the formation of a $N_{2}$ molecule, three electrons are shared by each atom of nitrogen.

(v) The number of single covalent bonds in a $C_{2} H_{2}$ molecule is two.

(vi) Melting points and boiling points of ionic compounds are generally higher than those of covalent compounds.

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Similar questions

Q. Fill in the blanks in the following sentences:
(i) Two atoms of the same element combine to form a molecule. The bond between them is known as ................ bond.
(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as ..........
(iii) In forming oxygen molecule, .............. electrons are shared by each atom of oxygen.
(iv) In forming N₂ molecule, .............. electrons are shared by each atom of nitrogen.
(v) The number of single covalent bonds in C₂H₂ molecule are ...........
(vi) Melting points and boiling points of ionic compounds are generally ............ than those of covalent compounds.

Whenever a non-metallic combines with another non metal, sharing of electron takes place between their atoms and a covalent bond is formed. A covalent bond can also be formed between two atoms of the same non-metal. The shared electrons are counted with both the atoms due to which each atom in the resulting molecule gets an inert gas electron arrangement of 8 electrons (or 2-electrons) in the outermost shell eg : $H_{2}$ molecule.

Draw the electron dot structures for the following molecules.

1. Chlorine 2. Hydrogen chloride

3. Methane 4. Carbon dioxide

5. Ammonia 6. Water

7. Oxygen 8. Ethane

9. Nitrogen 10. Acetylene

Q. Assertion: The bonds found in a molecule of

N_{2}

are nonpolar covalent.
Reason: There is an equal sharing of electrons between the nitrogen atoms.

Q. Assertion : The atoms in a covalent molecule share electrons but some covalent compounds are polar compounds
Reason : In polar covalent molecules, the shared electrons will be close to one of the atoms.

Q. Fill in the blanks from the choices given below:
(i) In covalent compounds, the bond is formed due to the ________ (sharing/transfer) of electrons.
(ii) Electrovalent compounds have a ________ (low/high) boiling point.
(iii) A molecule of _________ contains a triple bond (hydrogen, ammonia, nitrogen).

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