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Unit 4 Test Review
Unit 4 Test Review
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1
If a neutral atom loses 3 electrons, what will its charge be?
-3
+3
0
2
What is the charge of a proton?
-1
+1
0
3
If an electons jumps from a lower energy level to a higher energy level what happens?
The charge changes
Energy is added
A proton is released
A photon is released
4
Vocab: equals the number of protons plus the number of neutrons in an atom of the element.
Atomic Number
Mole
Avogadro's Number
Mass number
5
Vocab: a unit or quantum of light released when an electron jumps from one energy level to a lower one
photon
energy
proton
orbital
6
Determine the mass in grams of 5.50 mol of Iron. The molar mass of Iron is 55.845 g/mol.
307.1475 grams
10.2 grams
307.14 moles
307 grams
7
Vocab: a region in the atom where there is a high probability of finding electrons
center
orbital
outside
nucleus
8
How was Dalton’s theory different from Democritus’s?
Dalton said atoms of an element are alike, but different from other element
Dalton’s atoms had a nucleus
They were exactly the same
Dalton’s atoms had electrons
9
Where is the majority of the mass in the atom located?
Electron Shell
Nucleus
Outside the atom
Outside the nucleus
10
The lowest state of energy of an electron is called the ______________________________________.
dormant state
orbital
nucleus
Ground state
11
Determine the mass in grams of 1.80 mol of Calcium. The molar mass of Calcium is 40.078 g/mol.
22.3 moles
72.1 grams
22.3 grams
72.1 moles
12
What is the mass number of an atom with 56 protons, 49 neutrons and 56 electrons?
105
56
49
13
Vocab: a subatomic particle that has no charge
proton
photon
neutron
electron
14
If an electon jumps from a higher energy level to a lower energy level what happens?
The charge changes
A photon is released
Energy is added
A proton is released
15
If a neutral atom loses 3 neutrons, what will its charge be?
+3
-3
0
16
Vocab: tells you how many protons are in an atom of the element
Avogadro's Number
Molar Mass
Mass number
Atomic Number
17
Vocab: a subatomic particle that has a negative charge
proton
electron
nucleus
neutron
18
Electrons can be found only in certain ______________________________________, not between levels.
nuclei
states
clouds
energy levels
19
Vocab: an atom’s central region, which is made up of protons and neutrons
photon
electron
nucleus
orbital
20
Vocab: The electrons in an atom’s outer energy level which determine the chemical properties of an atom
ground state electrons
outer electrons
orbital electrons
valence electrons
21
Which value represents the number of protons in an atom?
Charge
Mass Number
Atomic Number
22
Vocab: an atom that has the same # of protons but a different # of neutrons than other atoms of the same element
Nucleus
Ion
Proton
isotope
23
Vocab: unstable isotopes that emit radiation and decay into other isotopes.
Protium
Radioisotopes
Ions
Decaying isotopes
24
Vocab: a subatomic particle that has a positive charge
photon
electron
proton
neutron
25
What is the charge of a neutron?
-1
+1
0
26
According to the modern model of the atom
Electrons and protons circle neutrons
Neutrons have a positive charge
Moving electrons form an electron cloud
The number of protons for a given element varies
27
What was the main difference between Thomson and Rutherford’s model of the atom?
They both had a nucleus, but Thomson’s was + and Rutherford’s negative
Rutherford’s was a solid sphere while Thomson’s was a lego building block
Thomson had electrons in a sea of + charges, while Rutherford had a nucleus
They were exactly the same
28
The results from Rutherford’s experiment led to the discovery of what part of the atom?
Protons
The nucleus
Neutrons
Electrons
29
What defines an atom?
Number of electrons
Atomic number
Mass number
30
What is the atomic number of an atom with 56 protons, 49 neutrons and 56 electrons?
105
56
49
31
What is the charge of a electron?
-1
+1
0
32
Which value represents the # of protons + the # of neutrons in an atom?
Charge
Mass Number
Atomic Number
33
Thomson’s Cathode Ray Tube experiment revealed what about atoms?
The size of an atom
The nucleus
Positively-charged particles which he named protons and neutrons
Negatively-charged particles which he named electrons
34
Isotopes have a different number of which subatomic particle than other atoms of the same element?
Electron
Proton
Neutron
35
What was the analogy Thomson used to describe his model of the atom after discovering electrons?
Bowling Ball
Lego
Cherry
Plum Pudding
36
Which isotope of Chlorine listed below would have the MOST neutrons?
Chlorine - 28
Chlorine - 52
Chlorine - 37
Chlorine - 35
37
Vocab: The most common isotope of helium
protium
Hydrogen
Tritium
Deuterium
38
6.022 × 10^23 particles, called Avogadro’s number.
grams
weight
mole
molar mass
39
How many neutrons are in the isotope Nitrogen - 13 if it has an atomic number of 7?
7
8
6
10
40
An electron moves from the ground state to an excited state when it absorbs
A proton
An isotope
A neutron
A photon
41
How many neutrons are in the isotope Nitrogen - 15 if it has an atomic number of 7?
9
8
7
22
