Chemistry Lecture (Week 2) - 2.1 Bohr's Atomic Model

Chemistry Lecture (Week 2)

2.1 Bohr's Atomic Model

NFTF Session

10/8/2021

11.00am-12.00pm

Multiple Choice

The following is the term used to represent shell EXCEPT

• orbit

• principle quantum number

• energy level

• quantum number

• Principle Quantum Number

Multiple Select

Choose the correct Bohr's Atomic Model Postulates

• The electron is circulating the nucleus in a specific shell/energy level

• Electron can stays in between shell of the Hydrogen atom

• The transition of electron occur when electron absorbed energy. Electron from ground state is excited/jumped to an excited state

• The energy change of an electron can be calculated using a suitable formula.

Fill in the Blanks

When electron falls from an excited state to a ground state, a light wave released/emitted by electron is called as

Multiple Choice

_____________________ is the lowest energy level an electron will occupy in an atom at an ordinary condition

• ground state

• excited state

Multiple Choice

If energy is supplied, electron ___________ the energy and is _____________ from a lower energy level to a higher ones.

• absorbed, excited

• emitted, promoted

• absorbed, demoted

• emitted, demoted

Multiple Choice

Calculate the energy of electron at the energy level, n=6

• 6.055 x 10^-20 J

• 5.655 x10^-20 J

• -6.055 x10^-20 J

• 1.320 x10^-20 J

Multiple Choice

Which of the following line is correct when electron undergoes transition from excited state n= 7 to ground state n= 1

• 5th line

• 4th line

• 6th line

• 7th line

Open Ended

 $\Delta E\ =\text{h}v$  

what does h symbol represents?

Multiple Select

Which of the equations related in the relationship between energy difference, wavelength and frequency of photon emitted.

• $\Delta E\ =\frac{hc}{\lambda}$

• $\Delta E=hv$

• $\lambda\ =\ \frac{c}{v}$

• $En=-\ R_{H\ }\left(\frac{1}{n^2}\right)$

Multiple Choice

Choose the highest energy involved when an electron makes a transition.

• n=4 to n=3

• n=2 to n=1

• n=4 to n=2

• n=3 to n=1

Fill in the Blanks

A Balmer series spectrum is formed when electrons from excited state fall down to ground state of

Multiple Choice

transition of electron from an excited state to a ground state of n = 3 formed a photon. Which of the following series belongs to this respective transition?

• Balmer

• Pfund

• Brackett

• Lyman

• Paschen

Multiple Choice

transition of electron from an excited state to a ground state of n = 5 formed a photon. Which of the following series belongs to this respective transition?

• Balmer

• Pfund

• Brackett

• Lyman

• Paschen