What is the mass number?

sum of atoms protons and neutrons

What did Millikan contribute to Atomic theory?

He discovered the charge and the mass of an electron

What was Bohr's contribution to the Atomic Theory?

Electrons can jump from energy levels

What did Alchemists contribute to the theory of the atom?

They developed many laboratory techniques and equipment

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Atomic Theory

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Questions on #Atomic Theory to help grade 11 in #chemistry

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Questions 20

Answers

1
Elements combine in the same ratio by mass to form compounds is called the Law of
combining volumes
conservation of mass
multiple proportion
definite proportion
2
Who was NOT involved in the findings of mass and the atom?
Alchemists
Democritus
Henri Becquerel
Lavoisier
3
What is the mass number?
number of electrons
number of neutrons
sum of atoms protons and neutrons
number of protons in an atoms nucleus
4
What did James Chadwick do?
came up with the law of definite proportion
came up with the law of conservation of mass
discovered the neutron
5
What is the atomic number equal to?
# of neutrons
# of protons
Atomic mass
6
What did Millikan contribute to Atomic theory?
He discovered the charge and the mass of an electron
He discovered the neutron
He discovered the Nucleus
He discovered that matter cannot be created or destroyed
7
Who experimented with alpha particles in the Gold foil experiment?
Willem Roentgen
Marie Curie
Ms Otis
Ernest Rutherford
8
Who conducted the oil drop experiment?
Dalton
Lavoisier
Millikan
JJ Thomson
9
Who discovered all matter contains negatively charged particles called electrons?
Coulomb
JJ Thomson
Ben Franklin
Proust
10
According to Dalton's atomic theory, atoms
cannot be created or destroyed
of a single element are identical by mass
combine in whole numbers to form compounds
all of the above
11
What was Bohr's contribution to the Atomic Theory?
Said atoms can join other atoms to make new substances
Discovered protons
Discovered the nucleus
Electrons can jump from energy levels
12
What Scientist was involved in electricity and the atom?
Pierre Curie
Ben Franklin
none of the above
Democritus
13
What model did JJ Thomson make?
Billiard Ball
Nuclear model
Plum pudding
14
Who was considered the "father of chemistry"?
Dalton
Proust
Lavoisier
15
Who proposed that atoms contain a small region that's positively charged called the nucleus?
Marie Curie
JJ Thomson
Ernest Rutherford
Henri Becquerel
16
The idea that everything is made up of atoms was proposed by...
Aristotle
Dalton
Alchemists
Democritus
17
What did Alchemists contribute to the theory of the atom?
They developed many laboratory techniques and equipment
They were the first to think of the idea of the atom
Found the elixir of life
They discovered the electron
18
Who did experiments with electricity and the cathode ray tube?
Aristotle
Dalton
JJ Thomson
Lavoisier
19
What is a characteristic of Gamma Radiation?
high energy x-rays
all of the above
heavy and positively charged
high energy electrons
20
Who discovered x-rays given off by cathode ray tubes?
Marie and Pierre Curie
Henri Becquerel
Willem Roentgen

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