State the relation between atomic number and atomic mass for light Sta

1.	State the relation between atomic number and atomic mass for light State which elements are considered radioactive giving reasons.
Answer» For light elements, Atomic mass = 2 x Atomic number In other words, for light elements Number of neutrons (n) = Number of protons (p) Thus for light elements, nip 1 For example, in 10Ne²⁰ , /? = 10 ; « = 20 -10=10. Thus nip = 10/10=1 For heavier elements, nip > 1. For example, in 17CI³⁷ , p ~ 17 and n = 37- 17 = 20 Thus, nip = 20/17 = 1.176 If nip > 1.5, the nucleus of the elements becomes unstable and the element becomes radioactive. For example, in radioactive 92U²³⁵ , p = 92 and n = 235 – 92 = 143. Thus, ntp= 143/92= 1.554.

State the relation between atomic number and atomic mass for light State which elements are considered radioactive giving reasons.

Answer»

For light elements, Atomic mass = 2 x Atomic number

In other words, for light elements

Number of neutrons (n) = Number of protons (p)

Thus for light elements, nip 1

For example, in 10Ne²⁰ , /? = 10 ; « = 20 -10=10. Thus nip = 10/10=1

For heavier elements, nip > 1. For example, in 17CI³⁷ , p ~ 17 and n = 37- 17 = 20

Thus, nip = 20/17 = 1.176

If nip > 1.5, the nucleus of the elements becomes unstable and the element becomes radioactive. For

example, in radioactive 92U²³⁵ , p = 92 and n = 235 – 92 = 143.

Thus, ntp= 143/92= 1.554.

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