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Question
The element X has an atomic mass number of 238 and an atomic number
of 92. It emits an alpha particle forming an element y. Y can be represented
by:
Options
234
X
90
236
X
90
235
X
1
238
X
92
238
X
934
MCQ
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Solution
234
X
90
Explanation:
Given: Mass number (A) = 238
Atomic number (Z) = 92
Emission = 1 alpha (α) particle
The mass number.
An α-particle decreases the mass number by 4.
\[ A=238-4 \]
= 234
The atomic number.
An α-particle decreases the atomic number by 2.
\[ Z=92-2\]
= 90
\[{\,^{234}_{90}Y}\]
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