Electronic Configuration of Halogens

Q. How many unpaired electrons does the second excited state of halogens (= Cl, Br and I) have?

1. 7 unpaired electrons
2. There is no second excitation possible for Cl, Br and I.
3. None of the above
4. 5 unpaired electrons

Q. Which of the following species has four lone pairs of electrons?

1. I
2. O
3. $C{l}^{-}$
4. He

Q.

Identify the elements which have an atomic number - 1.

Q. How many unpaired electrons does the second excited state of halogens (= Cl, Br and I) have?

1. 5 unpaired electrons
2. 7 unpaired electrons
3. There is no second excitation possible for Cl, Br and I.
4. None of the above

Q. Which of the following species has four lone pairs of electrons?

1. I
2. O
3. $C{l}^{-}$
4. He