Exercise Class 8 science chapter 5 inside the Atom question answer| std 8 science chapter 5
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Class 8 science inside the Atom question answer
8th class inside the Atom Exercise
exercise class 8 science chapter 5 inside the Atom
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1. Answer the following.
a. What is the difference in the atomic
models of Thomson and Rutherford?
b. What is meant by Valency of an element?
What is the relationship between the
number of valence electron and valency?
c. What is meant by atomic mass
number? Explain how the atomic
number and mass number of carbon are
6 and 12 respectively.
d. What is meant
by subatomic
particle? Give brief information of three
subatomic particles with reference to
electrical charge, mass and location.
2. Give scientific reasons.
a. All the mass of an atom is concentrated
in the nucleus.
b. Atom is electrically neutral.
c. Atomic mass number is a whole number.
d. Atoms are stable though negatively
charged electron are revolving within it.
3. Define the following terms
a. Atom b. Isotope c. Atomic number
d. Atomic mass number e. Moderator in
nuclear reactor
4. Draw a neat lablled diagram.
a. Ruthrford's scattering experiment
b. Thomson's atomic model
c. Diagramatic sketch of electronic
configuration of Magnesium (Atomic
number 12)
d. Diagramatic sketch of electronic
configuration of Argon (Atomic number
18)
5. Fill in the blanks.
a. Electron, proton, neutron are the types of
in an atom.
b. An electron carries a
charge.
Exercises
38
c. The electron shell
to the nucleus.
d. The electronic
configuration of
magnesium is 2, 8, 2. From this it is
understood that the valence shell of
Magnesium is .......
e. The valency of hydrogen is 'one' as per
the molecular formula H,O. Therefore
valency of 'Fe' turns out to be.
as per the formula Fe₂O₂.
6. Match the pairs.
Group 'A'
a. Proton
b. Electron
c. Neutron
Group 'B'
i. Negatively charged
ii. Neutral
iii. Positively Charged
7. Deduce from the datum provided.
Datum
To deduce
Neutron number
Project:
is nearest
23 Na
11
14
6
37 Cl
17
Mass number
Proton number
Explain the atomic models using the
material such as old C.D., balloon,
thread, marbles, etc.
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