Question

Among the following, the elements with even number of neutrons is .
1)Na
2)Al
3)Ne
4)He​

Answer 1

Answer:

ne and na is the perfect answer

Answer 2

Answer: Ne(Neon) and He(Helium) will have an even number of neutrons i.e , 10 and 2 respectively.

Explanation: To calculate, the number of neutrons we use the formula:

N(number of neutrons) = (A) Atomic Mass - P/Z(Number of protons/ Atomic Number)        .......................{as we know, protons(P)= Atomic Number(Z)}

Na- A=22, Z/P=11

N= 22-11

N= 11(odd number)

Al- A= 26, Z/P= 13

N= 26-13

N= 13(odd number)

Ne- A=20, Z/P= 10

N= 20-10

N=10(an even number)

He- A= 4, Z/P= 2

N= 4-2

N=2(an even number)

Conclusion: Neutrons are subatomic particles that are one of the primary constituents of atomic nuclei. Neutrons do not have any net electric charge associated with them. They do, however, have a mass which is slightly greater in magnitude than that of a proton.