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chemistry class 9 chapter 5 exercise short questions
(1) State octet and duplet rules.
(ii) Explain formation of covalent bond between two nitrogen atoms
(i) How does Alform cation?
(iv) How does O from anion?
(v) Draw electron cross and dot structure for H₂O molecule.
3. Describe the importance of noble gas electronic configuration.
4. Explain how elements attain stability?
5. Describe the ways in which bonds may be formed.
6. Describe the formation of covalent bond between two non-metallic elements.
7. Explain with examples single, double and triple covalent bond.
8. Find the number of valence electrons in the following atoms using the periodic table:
(a) Boron
(b) Neon
(c) Rubidium
(d) Barium
93
Unit 5: Chemical Bounding
(e) Arsenic
9. Represent the formation of cations for the following metal atoms using electron dot structures.
(a) Al
(b) Sr
(c) Ba
10. A sample of sulphur from a volcano was analysed to give the following composition of isotops (At no of 5-16)
Isotope
Abundance (%)
S-32
95.0
5-33
0.76
5-34
(a) Define the term isotope
4.22
(b) Define the term relative atomic mass

(c) Calculate the relative atomic mass of sulphur
(d) Complete the following table.
5-32
Protons
Neutrons
5-34
Electrons
11. An atom of an element has atomic number 9 and mass number 19.
(a) State the number of protons and neutrons in the nucleus of this atom.
(b) State the number of electrons in this atom.
(c) Show with electron cross-dot diagrams, the formation of ions by this atom.
(d) Write electronic configuration of this element.
(e) Point out its group in the periodic table.
(f) Point out its period in the periodic table.
time lapse
0:00 introduction Unit 5: Chemical Bonding
00:45 (i)State octet and duplet rules.
02:36 (ii) Explain formation of covalent bond between two nitrogen atoms
05:04 (i) How does Al form cation?
08:26 (iv) How does O from anion?
10:31 (v) Draw electron cross and dot structure for H₂O molecule.
12:04 3. Describe the importance of noble gas electronic configuration.
12:51 4. Explain how elements attain stability?
13:24 5. Describe the ways in which bonds may be formed.
14:15 6. Describe the formation of covalent bond between two non-metallic elements.
15:14 7. Explain with examples single, double and triple covalent bond.
16:03 8. Find the number of valence electrons in the following atoms using the periodic table:
(a) Boron
(b) Neon
(c) Rubidium
(d) Barium
(e) Arsenic
18:13 9. Represent the formation of cations for the following metal atoms using electron dot structures.
(a) Al
(b) Sr
(c) Ba
23:05 10. A sample of sulphur from a volcano was analysed to give the following composition of isotops (At no of 5-16)
Isotope
Abundance (%)
S-32
95.0
5-33
0.76
5-34
(a) Define the term isotope
(b) Define the term relative atomic mass
(c) Calculate the relative atomic mass of sulphur
(d) Complete the following table.
5-32
Protons
Neutrons
5-34
Electrons
28:59 11. An atom of an element has atomic number 9 and mass number 19.
(a) State the number of protons and neutrons in the nucleus of this atom.
(b) State the number of electrons in this atom.
(c) Show with electron cross-dot diagrams, the formation of ions by this atom.
(d) Write electronic configuration of this element.
(e) Point out its group in the periodic table.
(f) Point out its period in the periodic table.