3 NEUTRON POINTS

Who used uranium salts to discover radioactivity?

3 NEUTRON POINTS

Which scientist discovered that radioactivity involves two emission of two kinds of particles: alpha and beta?

13 POINTS

Used his oil drop method for determining the charges in electrons
Successfully measured the charge of an electron
Oil drops were sprayed into the chamber and exposed to x rays, ionizing drops +’vely or -’vely
American Physicist

20 POINTS

British nuclear physicist
Discovered the neutron
his discovery led to new radioisotopes, split atoms and molecules, and the nuclear chain reactions that led to the atomic bomb.
Involved with the development of the atomic bomb

14 POINTS

Created the periodic table
His first periodic table listed the elements in order of increasing molar mass
Categorized elements by matching similar properties
He was surprisingly accurate and predicted where elements would go

21 POINTS

Studied electrical discharges of gases
Lead to new atomic models
Studied physics in addition to chemistry
Discovered gases had charges
Isolated Thallium
Invented Radiometer

22 POINTS

Studied/discovered electrons and protons
Created atomic model with protons and electrons inside
Proposed the plum pudding model of an atom
Nobel Prize in physics in 1906
Developed an experiment with cathode rays that were deflected by magnetic and electrical fields

15 POINTS

English scientist and teacher
Studied behaviour of gases
Discovered all atoms of an element are identical
Model of the atom did not include electrical nature

23 POINTS

Discovered radioactivity → considered most dramatic scientific discovery
Received the Nobel Prize in Physics 1903
Helped created nuclear physics
Elected to Academy of Sciences after presenting his findings
Discovered Becquerel rays