Bohr's Model of Atom and Valency

The video explains the behavior of electrons in atoms, drawing parallels to motorcyclists in a globe of death. It introduces Bohr's model, where electrons revolve in discrete orbits around the nucleus without radiating energy unless they jump between energy levels. The video details electron distribution in shells, using the formula 2n², and provides examples of electronic arrangements for various elements. It also covers valency, the tendency of elements to gain, lose, or share electrons to achieve a stable octet, using sodium chloride as an example.

What is the main concept behind Niels Bohr's model of the atom?

• Electrons revolve in elliptical orbits around the nucleus.

• Electrons are stationary around the nucleus.

• Electrons revolve in discrete orbits called energy levels.

• Electrons revolve in random orbits around the nucleus.

How many electrons can the K shell accommodate?

• 4 electrons

• 6 electrons

• 8 electrons

• 2 electrons

What is the electronic arrangement of carbon?

• 2, 4

• 2, 8

• 2, 2

• 2, 6

What is valency?

• The combining capacity of an element.

• The number of neutrons in an atom.

• The number of protons in an atom.

• The atomic mass of an element.

How does sodium achieve stability when forming sodium chloride?

• By gaining two electrons.

• By losing one electron.

• By gaining one electron.

• By sharing two electrons.

What is the valency of an element with 7 electrons in its outermost shell?

• 8

• 7

• 2

• 1

How many electrons does oxygen need to gain to achieve an octet?

• 1 electron

• 2 electrons

• 3 electrons

• 4 electrons