Chapter 3:Arrangement of Electron in the Atom

Question 1

energy level

Answer 1

is defined as the fixed energy value that an electron in an atom may have.

Question 2

ground state

Answer 2

of an atom is one in which the electrons occupy the lowest available energy level

Question 3

excited state

Answer 3

of an atom is one in which the electrons occupy higher energy levels than those available in the ground state

Question 4

Orbitals

Answer 4

is a region in space within which there is a high probability of finding an electron

Question 5

Sublevel

Answer 5

is a subdivision of a main energy and consists of one or more orbitials of the same energy

Question 6

Continuous Spectrum

Answer 6

The array of colours (from broken up light) from white light passed through a glass prism.

Question 7

Line Spectrum

Answer 7

A series of narrow coloured lines shown by an electric current passed through a hydrogen discharge tube.

Question 8

IR Range

Answer 8

n=3,4 or 5

Question 9

Atomic Absorption Spectrometry

Answer 9

When white light passes through a gaseous sample of an element.It is found that the light that emerges
has wavelight missing

Question 10

What are emission line spectrum used for?

Answer 10

Detecting the presence of elements (Different elements have different colours)

Question 11

Limitations of Bohr’s Theory

Answer 11

1. Failed to account for many of the lines in the emission spectra of atoms.
2. Electron had a wave motion.
3. High probability of finding an electron in a region in space.
4. It didnt take into account the presence of sublevels

Question 12

P-Orbitals

Answer 12

Dumbell-Shaped

Question 13

S-Orbitals

Answer 13

Spherical

Question 14

Uses of Atomic Absorption Spectrometry

Answer 14

1. Detecting the presence of certain elements in materials dissolve in water.
2. For measuring the concentrations of these elements.

Question 15

What was the idea of quantisation Bohr introduced?

Answer 15

Electron can only have a quantum(fixed amount )

Question 16

What was Bohr’s Theory?

Answer 16

An electron in hydrogen occupies fixed energy levels. The electron is in its ground state
and when supplied with energy moves up an energy level and is now in an excited
state. It is unstable and falls back to its ground state producing a photon of light.
E 2 - E 1 = hf

Question 17

What was Bohr’s idea of an orbit?

Answer 17

Electrons revolve around the nucleus in fixed paths (orbits = energy levels,n) which have a fixed amount of energy .