Unit 1: Atomic Theory

Question 1

Scientists

Answer 1

John Dalton - atom theory, billiard ball
Rutherford - alpha particles, beehive model
JJ Thomson - electrons, plum pudding
Dmitri Mendeleev - periodic table

Question 2

Electron configuration

Answer 2

Cu, Ag, Au

Question 3

Ground state, excited state

Answer 3

Ground state: the state of lowest energy for that electron
Excited state: the state of highest energy for that electron

Question 4

Distance between electron and nucleus - relationship

Answer 4

The further away an electron is from the nucleus, the greater its energy
- As an electron moves towards the nucleus, it emits energy (in the form of colour)
- Red, blue, purple, violet

Question 5

Isotope

Answer 5

Members of a family of an element that all have the same number of protons but different numbers of neutrons

Question 6

Calculating AAM (average atomic mass)

Answer 6

(atomic mass of Afraction of A) + (atomic mass of Bfraction of B) + …
- Mass of an element is determined by the average of all amus of the isotopes
- Think about abundance of isotope