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MCQs: Both elements of 1st period contain valence electrons in
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MCQs: In the periodic table, helium is placed at
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MCQs: Across the period the atomic size decreases due to
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MCQs: The first three periods are
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MCQs: On basis of electronic configuration the group and period of ⁹₅B is
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MCQs: Chemical properties depend upon
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MCQs: Nobel gases are present in
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MCQs: The energy required to remove an electron from the outermost shell is called
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MCQs: As we go from top to bottom in a group the shielding effect
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MCQs: Group A elements are called
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MCQs: Period number of the element indicates the value of
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MCQs: The ability of an atom to attract electrons towards itself is called
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MCQs: The average distance between the nucleus and outer shell is called
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MCQs: The horizontal rows of the periodic table are called
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MCQs: The shielding effect across the period
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MCQs: The period number of ²⁷₁₃Al is
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MCQs: In periodic table elements with similar valence shell configuration are placed in
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MCQs: When an electron is added in the valence shell than
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MCQs: The value of ionization energy
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MCQs: Groups contain alkaline earth metals are
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