The number of d-electrons in Fe²⁺ (Z=26) is not equal to the number of electrons in

which one of the following?

1. s-electrons in Mg (Z=12)

2. p-electrons in Cl (Z=17)

3. d-electrons in Fe (Z=26)

4. p-electrons in Ne (Z=10)

Which is the correct order of increasing energy of the listed orbitals in the atom of

titanium?

1. 3s 4s 3p 3d                   

2. 4s 3s 3p 3d

3. 3s 3p 3d 4s                   

4. 3s 3p 4s 3d

Calculate the energy in Joule corresponding to light of wavelength 45 nm : (Planck's

constant h = 6.63 x 10^-34 Js; speed of light c = 3 x 10⁸ ms^-1)

1. 6.67 x 10¹⁵                             

2. 6.67 x 10¹¹

3. 4.42 ^x10-15                             

4. 4.42 x 10^-18

What is the maximum numbers of electrons that can be associated with the following set

of quantum numbers?

n=3, l = 1 and m=-1

1. 10

2. 6

3. 4

4. 2

From the given equation, certain conclusions are drawn.
\(\mathrm{E}=-2.178 \times 10^{-18} \mathrm{(J)} \frac{\mathrm{z}^2}{\mathrm{n}^2} \)$\mathrm{}$
Choose the incorrect statement:

The maximum number of electrons in a subshell with l = 3 and n = 4 is

1. 14

2. 16

3. 10

4. 12

The correct set of four quantum numbers for the valence electron of rubidium atom (Z =37) is

1. 5, 1, 1, +1/2               

2. 6, 0, 0, +1/2

3. 5, 0, 0, +1/2               

4. 5, 1, 0, +1/2

The total number of atomic orbitals in fourth energy level of an atom is

1. 16                                 

2. 32

3. 4                                   

4. 8

If the principal quantum number n=6, the correct sequence of filling of electrons will be:

Which one of the following ions has electronic configuration [Ar]3d⁶?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

1. Ni³⁺               

2. Mn³⁺

3. Fe³⁺               

4. Co³⁺