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ICSE Class 10 Physics Question 9 of 20

Solved 2016 Question Paper ICSE Class 10 Physics — Question 17

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Question

Question 4(b)

An element ZSA decays to 85R222 after emitting 2 α particles and 1 β particle. Find the atomic number and atomic mass of the element S. [2]

Answer

85R222_{85}\text{R}^{222} before the emission of β particle, would have atomic number 84, and before 2 α emissions, atomic number would have been 88. Hence, atomic number of X = 88.

85R222_{85}\text{R}^{222} before the emission of β particle, would have mass number 222, and before 2 α emissions, mass number would have been 230. Hence, mass number of X = 230.