The number of neutrons in the element L is

• Atomic Structure

Consider the following nuclear reactions:

²³⁸₉₂M → ^X_YN + 2⁴₂He  ;  ^X_YN → ^A_BL + 2β⁺

The number of neutrons in the element L is

1. 146
2. 144
3. 142
4. 140

Answer

²³⁸₉₂M → ^X_YN + 2⁴₂He

^X_YN → ^A_BL + 2β⁺

Therefore, number of neutrons in element L = 230 - 86 = 144

The correct option is B.