WB JEE 2020 | Atomic Structure Question 9 | Chemistry

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The radius of the first Bohr orbit of a hydrogen atom is 0.53 $$\times {10^-8}$$ cm. The velocity of the electron in the first Bohr orbit is

$$2.188 \times {10^8}$$ cm s^-1

$$4.376 \times {10^8}$$ cm s^-1

$$1.094 \times {10^8}$$ cm s^-1

$$2.188 \times {10^9}$$ cm s^-1

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The number of unpaired electrons in the uranium (₉₂U) atom is

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The difference between orbital angular momentum of an electron in a 4f -orbital and another electron in a 4s-orbital is

$$2\sqrt 3 $$

$$3\sqrt 2 $$

$$\sqrt 3 $$

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

Which one of the following electronic arrangements is absurd?

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

n = 3, l = 0, m = 0

n = 2, l = 0, m = $$-$$1

n = 2, l = 1, m = 0

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