Chemistry STPM : Electronic Structure Of Atom

Which of the following electron transition occurs in the ultraviolet range of the elctromagnet spectrum?

• n₃ to n₁

• n₃ to n₂

• n₄ to n₃

• n₂ to n₃

Which of the following electron transitions in the hydrogen atom has the highest frequency?

• n₃ to n₁

• n₄ to n₂

• n₅ to n₃

• n₇ to n₂

How many lines can be formed in the ultraviolet range for all the transitions involving the first seven energy levels in the emission spectrum for the hydrogen atom?

• 18

• 10

• 7

• 6

For the hydrogen atom, the electron transition with the longest wavelenght is

• n₃ to n₁

• n₄ to n₂

• n₅ to n₁

• n₇ to n₅

What is maximum number of possible lines formed for all the transitions involving the first six energy levels in the emission spectrum for the hydrogen atom?

• 15

• 11

• 6

• 5

The emission spectrum of hydrogen atom is a line spectrum because

• energy is required to excite an electron

• electrons which are unstable will radiate energy

• an excited electron has a higher energy and is not stable

• the energy of an electron an a hydrogen atom is quantised

An electron is exited from the energy level n=2 to the energy n=6. Which of the following statements is correct?

• The electron will achieve a higher stability

• The electron cannot return to the energy level n=1

• This transition produces a dark line in the violet region of visible light

• Energy with a frequency corresponding to that of green light is absorbed

One of the lines in the spectrum of hydrogen atom has a wave number of 7.80 x 10¹⁴ s^-1. What is the frequency of this line? (c = 3 x 10⁸ ms^-1)

• 2.34 x 10¹⁴ s^-1

• 2.34 x 10¹³ s^-1

• 3.84 x 10¹⁴ s^-1

• 3.84 x 10¹³ s^-1

Which of the following statements is true about the Lyman and Balmer series?

• The intensity decreases as the frequency increases.

• The converging frequency for both series is the same.

• The line spectra for both series are formed in the visible light range.

• The spacing between the lines increases as the frequency increases.

An excited electron residing in the energy level n = 4 drops to n = 1. What is the wavelenght of the emission if the frequency is 3.09 x 10¹⁵ Hz? (c = 3 x 10⁸ ms^-1)

• 4.69 x 10^-6 m

• 2.91 x 10^-7 m

• 3.88 x 10^-7 m

• 9.71 x 10^-8 m