Which of the following was NOT part of Dalton's Atomic Theory?

Isotopes have different numbers of neutrons.

positively charged and in the nucleus

How can the number of neutrons for an atom be found?

by subtracting the atomic number from the mass number

The mass number of an atom is found by

adding the number of protons to the number of neutrons

negatively charged and surrounding the nucleus

What does Potassium-40 mean?

Potassium with a mass number of 40

of the same element with different numbers of neutrons

Rutherford's "gold foil" experiment proved that

protons are in the nucleus of an atom

What does Uranium-235 mean?

Uranium with a mass number of 235

The two isotopes of Boron are Boron-10 and Boron-11. Boron's mass on the Periodic Table is 10.811. This means that

There is more Boron-11 than Boron-10

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Chemistry: Chapter 4 (Pearson)

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Questions 25

Answers

1
Who first used the term "atom?"
Democritus
J. J. Thomson
Ernest Rutherford
John Dalton
2
Who performed the "gold foil" experiment?
Ernest Rutherford
Robert Millikan
John Dalton
J. J. Thomson
3
Which of the following was NOT part of Dalton's Atomic Theory?
Isotopes have different numbers of neutrons.
All matter is composed of tiny particles called atoms.
Atoms cannot be subdivided, created, or destroyed.
Atoms of a given element are identical.
4
Who is considered to be the "Father of Chemistry?"
Democritus
John Dalton
Amodeo Avogadro
Ernest Rutherford
5
Protons are
negatively charged and surrounding the nucleus
neutral and surrounding the nucleus
positively charged and in the nucleus
neutral and in the nucleus
6
How can the number of neutrons for an atom be found?
It is equal to the number of electrons
It is equal to the number of protons
by adding the protons and electrons
by subtracting the atomic number from the mass number
7
The mass number of an atom is found by
subtracting the atomic number from the number of electrons
adding the number of protons to the number of neutrons
adding the number of neutrons to the number of electrons
doubling the number of protons
8
Experiments in the late 1800's with "Cathode Rays" led to the discovery of
electrons
atoms
protons
neutrons
9
How many protons are in an atom of Aluminum?
13
27
14
19
10
Why do most of the mass numbers on the periodic table have a decimal amount?
because they are averages
because some atoms have more protons
because we aren't sure of the actual masses
because some atoms don't have electrons
11
How many neutrons are in an atom of Argon-40?
18
40
22
12
12
How many protons are in a atom of Phosphorus?
7
31
15
16
13
How many neutrons are in an atom of Silicon-28?
13
14
28
21
14
Electrons are
negatively charged and surrounding the nucleus
neutral and surrounding the nucleus
neutral and in the nucleus
positively charged and surrounding the nucleus
15
What does Potassium-40 mean?
Potassium with a mass number of 40
Potassium with an atomic number of 40
Potassium with 40 neutrons
Potassium with 40 protons
16
Who performed the "oil drop" experiment?
Robert Millikan
J. J. Thomson
Ernest Rutherford
John Dalton
17
Isotopes
will have different atomic numbers.
have different atomic number and masses.
will have different numbers of electrons.
will have different masses.
18
Isotopes are atoms
with special types of protons
of different elements with the same number of electrons
of different elements with different atomic numbers
of the same element with different numbers of neutrons
19
Rutherford's "gold foil" experiment proved that
neutrons are negatively charged
electrons are positively charged
protons are in the nucleus of an atom
neutrons exist
20
Whose experiments measured the charge-to-mass ratio of an electron?
Ernest Rutherford
Robert Millikan
J. J. Thomson
John Dalton
21
What does Uranium-235 mean?
Uranium with 235 electrons
Uranium with a mass number of 235
Uranium with 235 neutrons
Uranium with an atomic number of 235
22
Who discovered neutrons in 1932?
J. J. Thomson
James Chadwick
Ernest Rutherford
John Dalton
23
How many electrons are in a normal atom of Sodium?
16
12
11
23
24
The two isotopes of Boron are Boron-10 and Boron-11. Boron's mass on the Periodic Table is 10.811. This means that
There is more Boron-11 than Boron-10
Boron-10 does not actually exist
There is more Boron-10 than Boron-11
Only Boron-11 exists
25
What law says that a compound contains the same elements in exactly the same proportions?
Law of Definite Proportions
Law of Conservation of Mass
Law of Multiple Proportions
Law of Conservation of Energy

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