An unknown element produces two peaks in its mass spectrum at (m/z=64 ) and (m/z=66 )

CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure

Problem

An unknown element produces two peaks in its mass spectrum at

m/z=64

and

m/z=66

. The peak at 64 has twice the relative intensity of the peak at 66. Which of the following best describes the natural isotopic composition of the element? (a) approximately 50\%

^{64}\text{X}

and 50\%

^{66}\text{X}

(b) approximately 67\%

^{64}\text{X}

and 33\%

^{66}\text{X}

^{64}\text{X}

and 25\%

^{66}\text{X}

(d) approximately 33\%

^{64}\text{X}

and 67\%

^{66}\text{X}

Related theory

Subatomic Particles
Atomic Structure
The nuclear atom

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