Some Scientists Scientists
Who conducted the gold foil experiment?
Ernest Rutherford
What did Lavoiser contribute toward the Atomic Theory?
Proposed the Law of Conservation of Matter
Created the metric system
What is the Atomic Number equal to?
The number of Protons
What does the Law of Conservation of Matter State?
Matter cannot be created or destroyed. It can only be converted into other matter.
Who made the plum pudding model of an atom?
J.J Thomson
What was Dalton's contribution to the Atomic Theory?
Atoms of the same element are exactly alike.
Atoms of different elements are different.
Atoms can join with other atoms to make new substances.
How do you determine the number of electrons in an uncharged atom?
Protons = Electrons
What does the plum pudding model show?
An atom is a ball of positively charged material with negatively charged particles floating around inside.
What major contribution did Thomson make to the Atomic Theory?
Discovered that atoms can be split into smaller particles (protons and electrons).
What was Bohr's contribution to the Atomic Theory?
Electrons travel around the nucleus of an atom in definite paths.
Electrons can jump from one energy level (path) to another.
How do you calculate the number of Neutrons?
Atomic Mass - Atomic Number = # of Neutrons
What does the Bohr model look like?
Similar to a model of the solar system.
The nucleus (with protons) is in the center.
Electrons orbit the nucleus in different levels.
What major contribution did Rutherford provided to the Atomic Theory?
Discovered that atoms have a positive charge in the core and negative charges outside the core.
Atoms are mostly made of space.
What was Chadwick's contribution to the Atomic Theory?
Discovered the existence of neutrons.
He found that the atomic mass of most elements is double the number of protons for one atom of that element.
How many electrons can travel in each orbit (level) of an atom?
First level (K) = 2
Second level (L) = 8
Third level (M) = 8
Fourth level (N) = 18
Fifth level (O) = 18
Sixth level (P) = 32
Seventh level (Q) = 32
What was done in the gold foil experiment?
A beam of positively charged particles was aimed at a piece of gold foil.
Most of the light passed through the foil in a straight line.
Many particles bounced off the foil in different directions.