SC3 - Atomic Structure

Question 1

what is all matter made up of

Answer 1

tiny particles called atoms

Question 2

what is an atom

Answer 2

atoms are tiny, hard spheres that cannot be broken down into smaller parts
they cannot be created or destroyed
the atoms in an element are all identical

Question 3

describe a proton, electron and neutron

Answer 3

proton- charge of +1 with a ram of 1
electron - charge of -1 with a ram of 1/1835
neutron- no charge with a ram of 1

Question 4

what is the diameter of an atom compared to the nucleus

Answer 4

diameter of atom = 100 000 x dimameter of nucleus

Question 5

what are the mass number and atomic number

Answer 5

atomic number = number of protons
mass number = number of protons + neutrons

Question 6

what was the Rutherford experiment

Answer 6

the gold foil experiment where charges alpha particles were fired at a

Question 7

how were elements in the periodic table originally ordered

Answer 7

by the masses of their atoms

Question 8

what is an isotope

Answer 8

same atomic number different mass number

Question 9

why are atoms weights given in relative atomic mass

Answer 9

the mass of an atom is so incredibly small so its measures relative to a carbon-12 atom this has a mass of exactly 12

Question 10

how do you calculate relative atomic mass of isotopes

Answer 10

total mass of atoms / number of atoms

example
75% of 35CL 25% of 37CL

(75x35)(25x37)/100 = 35.5