Structure of Atom Test - 10

α-particle (He²⁺) has very high mass compared to proton and electron, therefore very small e/m ratio. Proton and electron have same charge (magnitude) but former is heavier, hence has smaller value of e/m.

No of electron = No of protons 
So electronic configuration = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰

Here  l = 3 means the sub shell is f and

n = 4 means it is present in 4th orbit. Finally it is a 4f sub shell.

The no of orbital in f sub shell =2l + 1 = 2 × 3 + 1 = 7

Each orbital can accommodate 2 electrons. 7 × 2 = 147 × 2 = 14 electrons.

Maximum number of electrons in a sub shell with l=3 and  n=4 (4f) is 14 electrons.

The photoelectric effect is the emission of electrons or other free carriers when light is shone onto a material. Electrons emitted in this manner can be called photo electrons.

if n=3 then l = 0,1,2 i.e. only 3s,3p,3d orbitals are possible.