Scientists

Question 1

Niels Bohr

Answer 1

Electrons in specific orbits

Question 2

Louis de Broglir

Answer 2

Electrons in orbitals

Question 3

J.J. Thompson

Answer 3

Discovered electron using cathode ray

Question 4

Robert Millikan

Answer 4

Discovered charge of electron using oil drop experiment

Question 5

Ernest Ritherford

Answer 5

Found that most of an atom is empty space and there is a nucleus
Discovered protons
Gold foil experiment

Question 6

James Chadwick

Answer 6

Found neutrons

Question 7

Henry Mosley

Answer 7

Determined atomic number of elements using x-Rays

Question 8

Heisenberg uncertainty principle

Answer 8

Cannot determine both location and velocity of electron at the same time

Question 9

Max Planck

Answer 9

Light consists of both particles and waves

Question 10

Pauli Exclusion Principle

Answer 10

Electrons cannot have same quantum numbers

Cannot have two electrons with same spin in one orbital

Question 11

Five ideas of Dalton’s atomic theory

Answer 11

1) all matter is made up of atoms
2) all atoms of an element weigh the same, and different atoms of different elements have different weights
3) atoms cannot be divided, created, or destroyed
4) atoms combine in simple whole number ratios
5) in chemical reactions, atoms are combined, separated, or rearranged