passwella.
Menu

JAMB Chemistry 1981 Question 1

Question 1

Atomic Structure

An element X has 127 neutrons and 82 electrons. Its atomic number is

  1. A.209
  2. B.105
  3. C.45
  4. D.82
  5. E.127
Show the answer and explanation

Answer: D (82)

Explanation

A neutral atom has as many protons as electrons, so X has 82 protons. The atomic number is the number of protons, 82.