All Solutions

Exercise 1

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The nucleus of an element is denoted as $^A_Z$X.

where X represents the element, $Z$ is the atomic number (Number of Protons) and $A$ is the mass number (Number of nucleons).

The mass number is the sum of number of protons and number of neutrons. That is,

$A = Z+N$ ; $N$ – Number of neutrons.

In $^3_1$H,

$Z=1$, $A=3$ and $N=A-Z = 3 – 1 = 2$

So tritium nucleus has one proton and two neutrons.

Result

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See Solution.

Exercise 2

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A nucleus with 7 protons and 6 neutrons has atomic number $Z=7$ and mass number $A=Z+N=7+6 = 13$.

Nitrogen (N) is the element with $Z=7$.

So the nucleus with 7 protons and 6 neutrons is $^{13}_7$N.

Result

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$^{13}_7$N

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