How many nuclear particles are in an atom of lead-210?

Question

A) 0
B)82
C)128
D)210
E)292

If anyone can help me out, I am doing a test review for a test a will be having on Tuesday.

Answer 1

well lead has mass no 210 and atomic no is 82.
so,it will be having 82 electrons and protons.the nuclear particles are 210-82=128.(excluding elcectrons u get this no.)

no of nuclear particles=mass no-atomic no.

the nuclear particles(both neutrons and protons) is 128.so, answer is C.

hope this helps

Answer 2

the lead 210 has an atomic number of 82 .

So it is composed of 82 protons and 128 neutrons

The number of paricles is the sum protnns + neutrons

Correct answer =210