Practice test

Atomic structure - Test Set 1

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    There will be maximum ______ electrons in N shell?
    1. 32
    2. 2
    3. 8
    4. 16
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  2. Question 2

    What is the maximum number of electrons that M shell can contain?
    1. 8
    2. 2
    3. 18
    4. 32
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  3. Question 3

    What is the maximum number of electrons that can be accommodated in the M shell of an atom?
    1. 2
    2. 6
    3. 8
    4. 18
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  4. Question 4

    The maximum number of electrons that can be configured in the fourth level of energy is.
    1. 2
    2. 32
    3. 18
    4. 8
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  5. Question 5

    Name the element which has an electronic configuration of 2, 8 and 7.
    1. Carbon
    2. Hydrogen
    3. Chlorine
    4. Helium
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  6. Question 6

    RRB Group-D 2018
    The electronic configuration of an element is 2, 8, 5. What is the name of that element?
    1. Phosphorus
    2. Sulphur
    3. Chlorine
    4. Magnesium
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  7. Question 7

    Which of the following is not an electronic configuration of any metal?
    1. 2,8,3
    2. 2, 1
    3. 2,8,1
    4. 2, 6
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  8. Question 8

    The atom whose number of electrons in its outer orbit is complete, has a valence of ________.
    1. Zero
    2. Eight
    3. Seven
    4. One
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  9. Question 9

    In the outermost orbit _________ , has the same number of electrons.
    1. O, F
    2. As, Bi
    3. H, He
    4. Ar, K
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  10. Question 10

    RRB ALP & Tec.
    In non-metals, usually in the outermost orbit has ___________ electrons.
    1. 8, 9 or 10
    2. 1, 2 or 3
    3. 5, 6, 7 or 8
    4. 10 or 18
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  11. Question 11

    The electronic configuration of an element is 2, 8, 4. The name of the element is
    1. Potassium
    2. Silicon
    3. Magnesium
    4. Sodium
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  12. Question 12

    The atomic number of an element is the number of _______ in the nucleus of each atom of that element.
    1. Protons
    2. Neutrons
    3. Mesons
    4. Electrons
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  13. Question 13

    The isotopes of an element have a mass number of 298. If its nucleus has 188 neutrons, what is its atomic number?
    1. 188.0
    2. 488.0
    3. 298.0
    4. 110.0
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  14. Question 14

    The atomic weight of an element is W and the atomic number is N. What will be the number of protons in the nucleus of this atom?
    1. N
    2. W
    3. W − N
    4. W + N
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  15. Question 15

    Which of the following elements has the lowest atomic mass?
    1. Nitrogen
    2. Hydrogen
    3. Lithium
    4. Helium
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  16. Question 16

    What are isotopes?
    1. Atoms of an element having the same atomic number and mass number and hence their physical properties are the same.
    2. Different forms of an element that have the same atomic number and mass number but have different physical properties
    3. Atoms of an element that have the same mass number but have different atomic numbers.
    4. Atoms of an element that have the same atomic number but have different mass numbers.
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  17. Question 17

    When you change the number of neutrons of an atom, its ______ changes?
    1. isotopic
    2. ion
    3. charge
    4. element number
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  18. Question 18

    Isobars have the same number of ______?
    1. Ion
    2. Nucleus
    3. Electron
    4. Proton
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  19. Question 19

    Atoms / molecules / ions with equal number of electrons are called___.
    1. Isotonous
    2. Isotope
    3. Isoelectronic
    4. Valence isoelectronic
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  20. Question 20

    Which of the following is a property of isotopes of an element?
    (i) They have the same atomic mass.
    (ii) Their atomic numbers are the same.
    (iii) They exhibit different physical properties.
    (iv) They exhibit similar chemical properties.
    1. (ii) and (iii)
    2. (ii), (iii) and (iv)
    3. (ii) and (iv)
    4. (i), (iii) and (iv)
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