Question

Mass number of an element is 2Z +6, where Z is the
number of electrons. Number of neutrons will be -​

Answer 1

Explanation:

Mass number = no. of protons + no. of neutrons

But,

No. Of electrons = no. of protons

Hence,

2Z+6=Z + No. Of neutrons

No. of neutrons = 2Z + 6 - Z = Z + 6

Answer 2

Answer:

No of neutrons are given by: (A−Z)

Given an atomic number (Z) and mass number (A), you can find the number of protons, neutrons, and electrons in a neutral atom. For example, a lithium atom (Z=3,A=7 amu) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7–3=4).