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Structure of the Atoms Test - 19

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Structure of the Atoms Test - 19
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The mass of an atom resides in:
    Solution
    The mass of an atom resides in its nucleus as it contains protons and neutrons. Atomic mass is the sum of mass of protons and neutrons.
  • Question 2
    1 / -0
    The positively charged center in an atom is called as:
    Solution

    Positively charged center in an atom is called as nucleus.

  • Question 3
    1 / -0
    Which of the following is not true for 7N14\displaystyle _7N ^{ 14 } ?
    Solution
    The general notation of an element is: ZXA_Z X^A, where X is the symbol of the element, Z its atomic number and A is the mass number.
    So, in 7X14_7 X^1414 is the mass number of nitrogen while 7 is the atomic number.
  • Question 4
    1 / -0
    Atomic number of carbon atom is:
    Solution
    Atomic number of carbon atom is 6. Electronic configuration of carbon is given by 2, 4.
  • Question 5
    1 / -0
    On the basis of Rutherford's model of an atom, which sub-atomic particle is present in the nucleus of an atom?
    Solution
    On the basis of Rutherford's model of an atom, protons (positively-charged particles) particle are present in the nucleus of an atom.
  • Question 6
    1 / -0
    The electrons present in the outermost shell of an atom are known as :
    Solution
    The electrons present in the outermost shell of an atom are known as valence electrons.
  • Question 7
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    While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called ________.
    Solution
    While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called energy levels.
  • Question 8
    1 / -0
    If atoms of elements have completely filled the outermost shell then their combining capacity or valency is :
    Solution
    If atoms of elements have a completely filled outermost shell then their combining capacity or valency is zero.
    After completely filled shell it's stable so nonreactive.
  • Question 9
    1 / -0
    The electrons first occupy the shell having ______________.
    Solution
    The following rules are followed for occupying the number of electrons in different energy levels or shells:
    • The maximum number of electrons present in a shell is given by the formula 2n22n^2, where ‘n’ is the energy level index, 1,2,3,…. Hence the maximum number of electrons in different shells are as follows:
    1. First orbit or K-shell will be =2×12=2= 2 \times 12 = 2
    2. Second orbit or L-shell will be =2×22=8= 2 \times 22 = 8,
    3. Third orbit or M-shell will be=2×32=18 = 2 \times 32 = 18
    4. Fourth orbit or N-shell will be =2×42=32= 2 \times 42 = 32, and so on.
    • The maximum number of electrons that can be accommodated in the outermost orbit is 8.
    • Electrons are not accommodated in a given shell unless the inner shells are filled. That is, the shells are filled in a step-wise manner.

    So from the above explanation, it is clear that the electrons occupy the shell having the lowest energy level or K-shell and then move to the higher energy shells L, M, N. 
  • Question 10
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    The distribution of electrons in lithium is _________.
    Solution
    Atomic number of Li is 3. The distribution of electrons in lithium atom is 2 (K), 1 (L). There are 2 electrons in the innermost shell (K) and 1 in the outer shell (L).
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