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?

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 ions is not iso-electronic with F⁻ ?

Which one of the following statements is not correct?

Which one of the following statements is correct ?