What is the Energy of light emitted when an electron jumps from energy level 5 to 2? A. 4.8 x 10⁻¹⁹ J
B. 4.6 x 10⁻¹⁹ J
C. 4.1 x 10⁻¹⁹ J
D. 3.0 x 10⁻¹⁹ J

The answer to this problem is. 67

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Hope the image of the frequency formula

Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.