Question Detail

PHY 104 Atomic Structures Objective Question
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Question

In an alpha decay, what happens to the atomic number (Z) and mass number (A) of the parent nucleus?
Options
A Z increases by 1, A remains unchanged.
B Z decreases by 2, A decreases by 4.
Correct Answer
C Z remains unchanged, A decreases by 1.
D Z increases by 2, A increases by 4.
Correct Answer

Option B is the correct answer.

Detailed Explanation

The text explains alpha decay: 'emission of a particle (2 protons + 2 neutrons).' Consequently, 'The atomic number Z of the daughter Y nucleus therefore decreases by two while the mass number A decreases by 4.'

Hint

Remember an alpha particle is equivalent to a helium nucleus, consisting of 2 protons and 2 neutrons.

Question Info

Course: PHY 104
Topic: Atomic Structures
Type: Objective
Difficulty: Not specified
Question 147 of 947
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