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Question

On the basis of the electronic configuration of X95, the group number and period of the element ‘X’ is :


A

Group 15 period 2

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B

Group 13 period 2

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C

Group 9 period 5

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D

Group 13 period 5

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Solution

The correct option is B

Group 13 period 2


Explanation for correct answers:

Option B Group 13 period 2

  • The periodic table is a tabular display of the chemical elements.
  • The elements in the periodic table are arranged in order of atomic number.
  • The periodic table consists of 18 groups and 5 periods.
  • A period is the elements that are arranged in a horizontal row of the periodic table.
  • A group is the elements that are arranged in a vertical row of the periodic table.
  • The element can be uniquely represented as XZA, where X is the atomic symbol of the element, A is the mass number and Z is the atomic number.
  • Since the electronic configuration is given as X59, the group number of the given element ‘X’ 9 is the mass number and 5 is the atomic number.
  • Hence the element with the atomic number 5 is BoronB, and in the periodic table, Boron is in group 13

Explanation for incorrect answers:

Option A Group 15 period 5

  • The element with the atomic number 5 is BoronB, and in the periodic table, Boron is in group 13
  • Hence Option B is incorrect.

Option C Group 9 period 5

  • The element with the atomic number 5 is BoronB, and in the periodic table, Boron is in group 13
  • Hence Option C is incorrect.

Option D Group 13 period 5

  • The element with the atomic number 5 is BoronB, and in the periodic table, Boron is in group 13
  • Hence Option D is incorrect.

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