In Ra22688 nucleus, there are 
(a) 138 protons and 88 neutrons
(b) 138 neutrons and 88 protons
(c) 226 protons and 88 electrons
(d) 226 neutrons and 138 electrons

(b) XAz=Ra22688
Number of protons = Z = 88
Number of neutrons = A-Z = 226-88 = 138.

Difficulty Level:

  • 20%
  • 67%
  • 10%
  • 4%