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Question

Match the statements of Column A (Atoms) with those of Column B (Molecule Formed).


Column 1Column 2

A has 3 protons and B has 17 protons

A2B

A has 8 protons and B has 9 protons

AB3

A has 17 protons and B has 8 protons

AB

A has 5 protons and B has 9 protons

AB2

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Solution

The number protons tells the atomic number of the element because number of protons is equal to the number of electrons.

(A)

  • A has 3 protons and B has 17 protons: A has 3 protons means the atomic number of A is 3. So, A is Lithium (Li).
  • B has 17 protons means the atomic number of B is 17 , so B is Chlorine (Cl).
  • So, the compound formed will be Lithium chloride (LiCl) and it is AB-type.

(B)

  • A has 8 protons and B has 9 protons: A has 8 protons means the atomic number of A is 8. So, A is Oxygen (O).
  • B has 9 protons means the atomic number of B is 9, so B is Fluorine (F).
  • So, the compound formed will be Oxygen fluoride (OF2) and it is AB2-type.

(C)

  • A has 17 protons and B has 8 protons: A has 17 protons means the atomic number of A is 17. So A is Chlorine (Cl).
  • B has 8 protons means the atomic number of B is 8, so B is Oxygen (O).
  • So, the compound formed will be Chlorine oxide (Cl2O) and it is A2B-type.

(D)

  • A has 5 protons and B has 9 protons: A has 5 protons means the atomic number of A is 5. So A is Boron (B).
  • B has 9 protons means the atomic number of B is 9, so B is Fluorine (F).
  • So, the compound formed will be Boron trifluoride (BF3) and it is AB3-type.

Therefore, the answer is (A)(III),(B)(IV),(C)(I),(D)(II).


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