Chapter 2 & 3_ Atomic Theory

Question 1

A Sublevel

Answer 1

A subdivision of a main energy level and consists of one or more orbitals of the same energy

Question 2

Excited State

Answer 2

The electrons occupy higher energy levels than those available in the ground state.

Question 3

Ground State

Answer 3

The ground state of an atom is one in which the electrons occupy the lowest available energy levels.

Question 4

Cathode Rays

Answer 4

Are streams of negatively charged particles called electrons. They travel in straight lines from the cathode to the anode, are deflected by electric and magnetic fields and have sufficient energy to move a small object such as a paddle wheel.

Question 5

Dalton’s Atomic Theory

Answer 5

1) All matter is made up of very small particles called atoms.2) All atoms are indivisible. They cannot be broken down into simpler particles.

Question 6

Energy Level

Answer 6

The fixed energy value that an electron in an atom may have.

Question 7

Frequency of light emitted equation

Answer 7

E2- E1 = hf

Question 8

An Orbital

Answer 8

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

Question 9

Heisenberg’s Uncertainty Principle

Answer 9

States that it is impossible to measure at the same time both the velocity and the position of an electron.

Question 10

Emission Line Spectrum

Answer 10

consists of coloured lines against a dark background which corresponds to wavelengths emitted by a sample of gas.

Question 11

Atomic absorption spectrum

Answer 11

consists of dark lines against a coloured background which corresponds to wavelengths absorbed by a sample of gas.