2A.1 Structure of atoms and isotopes

Question 1

who discovered electrons and when?

Answer 1

J.J Thomson, in 1897

Question 2

who discovered protons and when

Answer 2

Ernest Rutherford, 1917

Question 3

who discovered neutrons and when

Answer 3

James Chadwick, in 1932

Question 4

what are a protons relative mass, relative charge, and position in the atom

Answer 4

1, 1+, in the nucleus

Question 5

what are neutron relative mass, relative charge, and position in the atom

Answer 5

1, 0, in nucleus

Question 6

what are electrons relative mass, relative charge, and position in the atom

Answer 6

1/1840, -1, energy levels surrounding the nucleus

Question 7

what is the Atomic number of an atom

Answer 7

number of protons

Question 8

what is the mass number of an atom

Answer 8

number of protons + number of neutrons

Question 9

who invented mass spectrometer and when

Answer 9

in 1919, Francis Aston invented the mass spectrometer, he discovered that not all atoms of an element have the same mass and that is caused because the atom has a different number of isotopes

Question 10

what are isotopes

Answer 10

atoms of the same element with different numbers of nuetrons