ATOMIC STRUCTURE (LECTURE)

Which of the following statements describes Bohr's atomic postulate?

• At ground state, electrons emit energy

• At excited state, electrons are very stable

• Electrons radiate energy while orbiting around the nucleus

• Electrons radiate energy when it fall back to lower energy levels

How the second line in the Balmer series of the hydrogen spectrum is formed?

• Transition from n = 3 to n =1

• Transition from n = 4 to n = 2

• Transition from n = 2 to n = 4

• Transition from n = 5 to n = 3

A wave with a longer wavelength will have a ............. frequency and ............... energy

• high, low

• high, high

• low, high

• low, low

Which of the following statements regarding orbitals is CORRECT?

• Each p-orbital can hold a maximum of 10 electrons

• The three 3p orbitals have the same energy.

• The 3p orbitals have a higher energy than the 3d orbitals.

• The 1s orbital has the same size and shape as the 2s orbital.

In the Bohr's atomic model, how do electrons travel?

• Electrons move in and out of the nucleus.

• Electrons move in a circular orbit around the nucleus.

• Electrons do not move.

• Electrons move in a straight line.

Which of the following is the second postulates of Bohr's atomic model?

• The energy of an electron in a hydrogen atom is quantised.

• Electron moves in a circular orbits around the nucleus.

• If energy is supplied, the electron absorbs the energy and is promoted from a lower energy level to higher energy level.

• At the excited state, the electron is unstable. It will fall back to a lower energy level and releases a specific amount of energy (photon) in the form of light

Which of the following line spectrum series of a hydrogen atom is found in the ultraviolet region?

• Pfund Series

• Lyman Series

• Paschen Series

• Brackett Series

"If waves can behave like particles, then particles can behave like a wave"

This is the idea behind,

• Bohr's atomic model postulate

• de Broglie postulate

• Heisenberg uncertainty principle

• Pauli exclusion principle

The shape of an orbital can be inferred from........ ?

• Principal quantum number (n)

• Azimuthal quantum number (l)

• Electron spin quantum number (s)

• Magnetic quantum number (m)

Which of these sets of quantum numbers is allowed?

• (n,l,m,s): (2,1,+2,+1/2)

• (n,l,m,s): (2,0,0,-1/2)

• (n,l,m,s): (2,3,+2,+1/2)

• (n,l,m,s): (3,-2,-1,-1/2)