The Atom

Question 1

Daltons Atomic Theory

Answer 1

all matter is made up of very small particles called atoms. all atoms are indivisible, cannot be broken down into simpler particles

Question 2

Cathode Rays

Answer 2

streams of negatively charged particles called electrons

Question 3

Energy Level

Answer 3

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

Question 4

Ground State

Answer 4

is one which electrons occupy the lowest available energy levels

Question 5

Excited State

Answer 5

is one which electrons occupy higher levels than those available in the ground state

Question 6

Heisenbergs Uncertainty Principle

Answer 6

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

Question 7

Orbital

Answer 7

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

Question 8

Sublevel

Answer 8

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