Atoms are on the periodic table

Question 1

Atom in 1989

Answer 1

Thomas discovered electrons (plum pudding model)

Question 2

Marsden

Answer 2

Bombarded a thin sheet of gold with alpha particles, almost all positivly particles went through the atoms, tiny amount deflected back

Question 3

Rutherford

Answer 3

Positive charge in atom in small area “nucleus” resulting in nuclear model replace plum pudding model

Question 4

Bohr

Answer 4

Electrons orbit nucleus distances otherwise spiral inwards
Discovered energy rings

Question 5

James chadwick

Answer 5

Provided evidence of neutrons in nucleus

Question 6

When were protons dicovered

Answer 6

Later experiments

Question 7

Atomic radius typically

Answer 7

0.1nm or 1 x 10[-10]

Question 8

Subatomic particles and relative mass and charge

Answer 8

Protons-1,+1
Neutron-1,0
Electron-very small,-1

Question 9

Where is most mass

Answer 9

Nucleus

Question 10

How do you work out number of neutrons

Answer 10

Mass number-atomic number

Question 11

What are protons and neutrons

Answer 11

Mass number

Question 12

What are number of protons

Answer 12

Atomic number

Question 13

What’s an isotope

Answer 13

An element with the same number of protons but a different number of neutrons
UNSTABLE

Question 14

How do atoms become ions

Answer 14

Gain or lose electrons

Question 15

How are positive or negative ions decided

Answer 15

Metals=lose atom for positive ion
Non-metal =gain electron to form negative ion