Question

An element P has an atomic mass of 239 and an atomic number of 92. It
emits a beta particle forming an element Q. Q can be represented by:

पर्याय

• 239

  X
  91

• 239

  X

  92

• 239

  X
  93

• 238

  X
  92

• 235

  X
  90

Answer 1

239

X
93

Explanation:

Given: Mass number (A) = 239

Atomic number (Z) = 92

Emission = 1 beta (β⁻) particle

The mass number.

When a β⁻-particle is emitted, the mass number remains unchanged.

\[ A=239 \]

The atomic number.

When a β⁻-particle is emitted, the atomic number increases by 1.

\[ Z=92+1\]

= 93

\[ {\,^{239}_{93}Q}\]