How is the Bohr model the same as the QMM?

Electrons orbit around the nucleus in fixed energy levels

What was shown in Thomson's cathode ray experiment?

A glowing beam that traveled from negative to positive.

Which is not a part of Dalton's theory?

Atoms of one element may chemically change into another.

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Unit 3 review

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Questions 26

Answers

1
The smallest particle of an element that retains the properties of that element.
Atom
Proton
Neutron
Electron
2
The nucleus has a _______ density.
Small
Big
3
An isotope of neon that has 10p+, 10e-, and 10 n0. Which describes another isotope of neon?
10 p+, 12 e-, 12n0
10 p+, 10 e-, 12n0
12 p+, 12e-, 12n0
11p+, 10e-, 10n0
4
Who was the first to name atoms?
Schenck
Democritis
Bohr
Dalton
5
The most common isotope of carbon is
carbon - 12
carbon - 66
carbon - 6
carbon - 13
6
____________ is the weighted average of the masses of the isotopes of a given element.
Atomic Number
Mass Number
Average Mass Number
Atomic mass
7
Who discovered neutrons?
Thomson
Goldstein
Rutherford
Chadwick
8
Who discovered the nucleus?
Rutherford
Goldstein
Chadwick
Thomson
9
Who came up with the planetary model?
Bohr
Democritis
Schenck
Dalton
10
Who was the first to relate chemical processes to the level of atoms?
Bohr
Schenck
Dalton
Democritis
11
What reason did Bohr give for electrons not falling into the nucleus?
They are repelled by having same charge as protons
Fixed Energy Level
Attached to the outer part of the atom through a bond
Random Energy Level
12
By definition atomic number is
Protons plus neutrons
Number of neutrons
Number of electrons
Number of protons
13
How is the Bohr model the same as the QMM?
They are nicknamed the planetary model
Electrons orbit around the nucleus in exact paths
Electrons orbit around the nucleus in fixed energy levels
They are both the most current model
14
Most of the atom is ___________
Positive
Negative
The Nucleus
Empty Space
15
Which statement is consistent with the results of Rutherford's gold foil experiment?
Atoms have a positive charge
The nucleus contains protons and electrons.
Atoms are mostly empty space
Mass is spread uniformly through the atom.
16
What do isotopes have in common?
same mass number
Same number of protons
same number of neutrons
everything
17
Who discovered electrons?
Rutherford
Chadwick
Thomson
Goldstein
18
The nucleus has a ___________ mass.
Small
Big
19
Which is not true about Rutherford's experiment?
All are true
Alpha Particles were shot into gold foil and some deflected.
Most of the time the alpha particles went through the foil.
A fluorescent screen was used to detect the particles.
20
_________ is a count of the total amount of neutrons and protons in an atom.
Mass Number
Atomic Number
Nucleus
Atomic Mass
21
What was shown in Thomson's cathode ray experiment?
A glowing beam that traveled from the center to each side.
A glowing beam that traveled from each side to the other.
A glowing beam that traveled from negative to positive.
A glowing beam that travelled from positive to negative.
22
Which statement is false?
Neutrons are in the nucleus
Electrons are 1 amu
The nucleus is positive
Protons are positive
23
Who discovered protons?
Chadwick
Goldstein
Rutherford
Thomson
24
The nucleus has a ________ volume.
Large
Small
25
______ are found in the nucleus
Nuetrons only
Electrons only
Protons and Neutrons
Protons only
26
Which is not a part of Dalton's theory?
All elements are composed of atoms.
Atoms of one element may chemically change into another.
Atoms of the same element are alike in mass and size.
Atoms that combine do so in whole number ratios.

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