Which of the following statements is incorrect about the structure of an atom?

Q. Which of the following statements is incorrect about the structure of an atom?

i. The whole mass of an atom is concentrated in the nucleus

ii. The atom is an indivisible particle

iii. The atom as a whole is neutral

iv. All the atoms are stable in their basic state

Choose the right option among the following:

A.            (i) and (iii)

B.            only  (ii)

C.            (ii) and (iv)

D.            none of these

Answer: (ii) and (iv)