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ICSE Class 10 Physics Question 3 of 25

Solved 2025 Question Paper ICSE Class 10 Physics — Question 13

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13
Question

Question 1(xiii)

A radioactive element P emits one α-particle and transforms to a new element Q. What will be the position of the element Q in the periodic table?

  1. One group to the left of P
  2. One group to the right of P
  3. Two groups to the right of P
  4. Two groups to the left of P
Answer

Two groups to the left of P

Reason — The reaction is :

ZAP ⟶Z−2A−4Q +24He_{\text Z}^{\text A}\text{P}\ \longrightarrow \\ _{\text Z - 2}^{\text A - 4}\text{Q}\ + \\ _{2}^{4}\text{He}

In periodic table elements are arranged in ascending order of atomic number and the atomic number of Q is 2 less than that of P. Hence, position of Q will 2 groups left of P.