Which one of the following scientists mentioned that an electron in an atom could revolve in certain stable orbits without the emission of radiant energy?

For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr’s model of an atom?

Which of the following is the electron configuration of a metallic element?

Which one of the following ions is not iso-electronic with F⁻ ?

Which one of the following statements is correct ?

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