Hello sir,

Only three kind of sub atomic particles are there :-

1. Electron:- This subatomic particles are negatively charged with a charge of -1.602 * 10 ^-19 C.

2.proton :- they's are positively charged subatomic particles with a charge of +1.602 * 10 ^-19 C.

3.neutron :- This sub

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Hey!

Solution is given below :

Since there are four metal atoms in one unit cell, the unit cell is fcc type. For fcc unit cell, radius r=0.3535 a, where a is the edge length of the unit cell. Hence, r=0.3535×361 pm =127.6 pm

Thus, the radius of one atom

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According to rydberg's equation 1/λ = RZ ² (1/n ₁ ² - 1/n ₂ ² )

λ is inversly proportional to n ²

therefore ..;;

λ1/λ2=n2 ² /n1 ²

As balmer series start from first line i.e, n1=2,n2=3,λ1=λ ,λ2=?

λ/λ2=3^2/2^2

λ/λ2=9/4

Therefore., wave length