Question

Determine the number of neutrons in an atom of Rg-272.

Answer 1

We Know, Atomic number of Uranium = 111
Molar mass in given species = 272

Now, Molar mass = Number of Protons + Number of Neutrons
272 = 111 + x
x = 272 - 111
x = 161

So, your final answer is 161

Hope this helps!

Answer 2

Step-by-step explanation:

Roentgenium is a radiactive element which is represented by symbol Rg. Atomic number of Rg is 111 and its atomic mass is 272.

It is known that atomic number is the number of protons present in an atom. Whereas atomic mass is the sum of total number of protons and neutrons present in an atom.

That is, Atomic mass = no. of protons + no. of neutrons

272 = 111 + no. of neutrons

no. of neutrons = 272 - 111

= 161

Thus, we can conclude that there are 161 neutrons present in Rg-272.