Which of the following statements are incorrect about the structure of an atom? (i) The atom as a whole is neutral. (ii) The atom is an indivisible particle. (iii) The whole mass of an atom is concentrated in the nucleus. (iv) All the atoms are stable in their basic state. Correct option is :

Rutherford's α-particle scattering experiment shows that : (i) electrons have negative charge. (ii) the mass and positive charge of the atom is concentrated in the nucleus. (iii) neutron exists in th…

Which one of the following statements about the properties of neutrons is not correct?

The mass number of argon is 40. Which one of the following statements is correct?

For Aluminium (Al) (atomic number: 13, mass number: 27), which one among the following statements is NOT correct?

Which one of the following statements is not correct?