1. The increasing order (lowest first) for the values of e/m (charge/mass) for

2. The ionization enthalpy of hydrogen atom is 1. 312 × 10J mol. The energy required to excite the electron in the atom from n = 1 to n = 2 is

3. or a given principal level n = 4, the energy of its subshells is in the order

4. A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

5. Which of the following statements in relation to the hydrogen atom is correct?

6. The magnetic quantum number specifies

7. The electronic configuration of silver atom in ground state is

8. Which of the following element has least number of electrons in its M-shell?

9. Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

10. In the ground state, an element has 13 electrons in its M-shell. The element is_____.