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Class 9 Science
Structure Of The Atom
Quiz 1
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Which of the following correctly represents the electronic distribution in the Mg atom?
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3, 8, 1
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2, 8, 2
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1, 8, 3
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8, 2, 2
Explanation
2, 8, 2
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of
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electron
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proton
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nucleus in the atom
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atomic mass
Explanation
nucleus in the atom
The number of electrons in an element X is 15 and the number of neutrons is Which of the following is the correct representation of the element?
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\(_{15}^{31}\)X
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\(_{16}^{31}\)X
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\(_{15}^{16}\)X
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\(_{16}^{15}\)X
Explanation
\(_{15}^{31}\)X
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is What is the number of electrons in the ion?
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13
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10
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14
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16
Explanation
10
The first model of an atom was given by
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N. Bohr
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E. Goldstein
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Rutherford
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J. J. Thomson
Explanation
J. J. Thomson
An atom with 3 protons and 4 neutrons will have a valency of
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3
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7
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1
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4
Explanation
1
Which of the following statement is always correct?
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An atom has equal number of electrons and protons.
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An atom has equal number of electrons and neutrons.
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An atom has equal number of protons and neutrons.
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An atom has equal number of electrons, protons and neutrons.
Explanation
An atom has equal number of electrons and protons.
Hydrogen exists in three isotopic forms, \(_{1}^{1}\)H, \(_{1}^{2}\)H, \(_{1}^{3}\)H known as protium, deuterium and tritium. Why are all the isotopes neutral in nature?
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Since neutrons are neutral in nature hence isotopes are electrically neutral.
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All the isotopes have one electron and one proton, hence they are neutral.
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All the isotopes have one proton and one neutron, hence they are neutral.
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Increasing number of protons in the isotopes make them neutral.
Explanation
All the isotopes have one electron and one proton, hence they are neutral.
How many electrons are present in M-shell of an element with atomic number 20?
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5
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8
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12
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18
Explanation
8
There are two atomic species X and Y, such that
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X and Y are isobars.
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X and Y have different chemical properties.
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X and Y have different physical properties.
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All of these.
Explanation
X and Y have different physical properties.
An alpha particle is also known as:
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subatomic particle
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an unionised helium atom
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a neutral particle
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a doubly-charged helium ion
Explanation
a doubly-charged helium ion
There are three isotopes of carbon which are named as C-12, C-13 and C-14 out of which C-12 is the most abundant isotope. In the given structures of 3 isotopes, what will be the composition of the nucleus?
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C-12 : 6p + 6n, C-13 : 7p + 6n, C-14 : 8p + 6n
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C-12 : 6p + 6n, C-13 : 6p + 7n, C-14 : 6p + 8n
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C-12 : 6p + 6n, C-13 : 5p + 8n, C-14 : 7p + 7n
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C-12 : 6p + 6n, C-13 : 12p + 1n, C-14 : 5p + 9n
Explanation
C-12 : 6p + 6n, C-13 : 6p + 7n, C-14 : 6p + 8n
Which of the following isotope is used in the treatment of blood cancer?
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P-32
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I-131
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Co-60
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any of these
Explanation
P-32
Isobars do not differ in the number of
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protons
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electrons
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neutrons
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nucleons
Explanation
nucleons
The maximum number of electrons that can be accommodated in third shell ( n = 3) is:
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10
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2
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18
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8
Which of the following have equal number of neutrons and protons?
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Chlorine
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Hydrogen
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Fluorine
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Deuterium
The nucleons are
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None of these
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Protons and neutrons
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Neutrons and electrons
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Protons and electrons
The nucleus of an atom contains:
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Protons only
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Neutrons
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Protons and neutrons
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Electrons only
Which of the following arrangements of electrons represent magnesium (Mg)?
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2, 8, 2
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2, 8, 3
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2, 8, 1
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2, 8, 4
The charge on an electron is:
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1.6 x 10-6 Coulombs
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1.6 x 10-20 Coulombs
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1.6 x 10-16 Coulombs
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1.6 x 10-19 Coulombs
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