C1

Question 1

what was bohrs model of the atom

Answer 1

small, dense nucleus surrounded by orbiting electrons

Question 2

what particles did chadwick discover

Answer 2

he proved the existence of neutrons

Question 3

what is an element

Answer 3

an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei

Question 4

what is a compound

Answer 4

When two or more elements chemically combine in a fixed ratio by mass,

Question 5

size of an atom ?

size of nuclei ?

Answer 5

The atom is about 10-10 meters (or 10-8 centimeters) in size

about 10–14 macross

Question 6

What is the charge of
a proton ?
neutrons ?
electrons ?

Answer 6

proton = 1+ (positive) 
neutral = 0 (neutral) 
electron = 1- ( negative)

Question 7

what is the mass of a
proton
neutron
electron

Answer 7

proton = 1 
neutron = 1 
electron = 0.0005

Question 8

for a particular atoms how do u work out the number of

protons
neutrons
electrons

Answer 8

protons = look up the atomic number

electrons = look up the atomic number

neutrons = top - bottom

Question 9

when non-metal atoms gain electrons what type of ions do they become ?

Answer 9

negative ions

Question 10

what did ancient greeks think atoms were like ?

Answer 10

solid spheres that couldnt be split into smaller parts

Question 11

John Daltons ideas ab atomic structure ?

Answer 11

thought atoms were solid spheres , made of different elements

Question 12

Thomsons plum pudding model ?

Answer 12

Ball of positive charge

only electrons - stuck randomly

Question 13

Rutherford gold foil experiment

Answer 13

fired alpha particles at a thin sheet of gold foil , most passed through

some deflected
some bounced backwards

Question 14

what did rutherford conclude

Answer 14

the positive charge is all centred in the central nucleus

cloud of negative electrons surround the nucleus

most of the atom is empty space