CHAPTER 2: BOHR'S ATOMIC MODEL

What is the tiny, massive central part of the atom?

• Neutron
• Electron
• Proton
• Nucleus

What are electrons?

• Massive, positively charged particles
• Tiny, negatively charged particles
• Clouds of dust in the nucleus
• Neutral particles around the nucleus

What identifies the element?

• Protons
• Neutrons
• valence electrons
• Nucleus

which type of subatomic particle is on the outer most orbital in the atom

• valence electron

• nucleus

• proton

• neutrons

1. What element is represented in this Bohr Model?

• Carbon

• Hydrogen

• Aluminum

• Lithium

In the Bohr model, how do electrons travel?

• Electrons move in and out of the nucleus

• Electrons do not move

• Electrons move in circular orbits around the nucleus

• Electrons move in a straight line

What is the spectrum region for Balmer series?

• Visible

• Ultraviolet

• Infrared

• X-rays

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

• n=6 to n=4

• n=3 to n=1

• n=5 to n=3

• n=4 to n=2

Which line spectrum series in ultraviolet region?

• Lyman

• Balmer

• Paschen

• Brackett

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

• Electron moves in circular orbits around the nucleus

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

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

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