The nucleus of the element _{21}E^{45} contai | vedclass

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(B) For an element represented as $_{Z}E^{A}$,the atomic number $Z$ represents the number of protons.Here,$Z = 21$,so there are $21$ protons.The mass

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$21$ protons and $24$ neutrons

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(B) For an element represented as $_{Z}E^{A}$,the atomic number $Z$ represents the number of protons.Here,$Z = 21$,so there are $21$ protons.The mass number $A$ is the sum of protons and neutrons $(A = Z + N)$.Therefore,the number of neutrons $N = A - Z = 45 - 21 = 24$.Thus,the nucleus contains $21$ protons and $24$ neutrons,and the element is Scandium $(Sc)$.

The nucleus of the element $_{21}E^{45}$ contains

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