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Concept 4.1-4.2 Review
1
A __________ is a substance containing two or more elements that are chemically
combined in a fixed ratio.
A
B
C
D
2
If a neutral atom contains 15 protons, then it must also contain 15 neutrons.
A
B
3
protons
neutrons
electrons
both A and B
The unique properties of an element are determined by its atomic structure.
A
B
8
True
False
Which of the following is normally found outside the nucleus of an atom?
A
B
C
D
7
7
14
21
28
Noble gases are very stable because their outermost electron energy levels contain the
maximum number of electrons that those outermost energy levels can possess.
A
B
6
protons and neutrons.
protons and electrons.
electrons and neutrons.
only one subatomic particle is charged.
A neutral atom has 14 electrons and 14 neutrons. What is its atomic number?
A
B
C
D
5
True
False
Two electrically-charged subatomic particles are
A
B
C
D
4
mixture
organism
compound
trace element
True
False
Neutral atoms of carbon-12 and carbon-14 have
A
B
C
D
the same number of protons.
the same number of neutrons.
the same number of electrons.
both A and C
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Page 1
Concept 4.1-4.2 Review
9
Matter is anything that occupies space and has mass.
A
B
10
carbon, calcium, nitrogen, helium.
carbon, hydrogen, water, nitrogen.
carbon, hydrogen, nitrogen, oxygen.
carbon, hydrogen, phosphorus, potassium.
Which of the following statements about trace elements in your body is TRUE?
A
B
C
D
15
True
False
The four most common elements found in living things are
A
B
C
D
14
14
16
28
30
Most of the mass of an atom is concentrated in the electron cloud.
A
B
13
they can damage parts of living cells.
they emit radiation in the form of matter and energy.
their nuclei break down over time, giving off radiation.
scientists can use them to trace what happens to different atoms within
organisms.
An isotope has 14 protons and 16 neutrons. What is the mass number of this isotope?
A
B
C
D
12
True
False
Radioactive isotopes are useful in biological research because
A
B
C
D
11
Page 2
Trace elements vary from person to person.
Nitrogen is an important trace element in your body.
Trace elements make up less than 0.01 percent of your body mass.
Even by eating a balanced diet, you would not be able to obtain any of the
trace elements your body needs.
The atomic number, which defines the identity and specific properties of an element, refers
to
A
B
C
D
the number of protons in the atom.
the number of neutrons in the atom.
the number of electrons in the atom.
the mass of the nucleus of the atom.
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Concept 4.1-4.2 Review
16
Anything that occupies space and has mass is known as a compound.
A
B
17
A compound is made of two or more elements chemically combined in a fixed ratio.
A
B
18
True
False
On the periodic table, the element sodium is represented by the symbol "S."
A
B
20
True
False
The second energy level of an atom can hold up to 8 electrons.
A
B
19
True
False
True
False
The elements Calcium (Ca), phosphorus (P), potassium (K), sulfur (S), sodium (Na),
Chlorine (Cl), and Magnesium (Mg) account for approximately ______ of your body mass.
A
B
C
D
4%
28%
65%
96%
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Page 3
Concept 4.1-4.2 Review
Page 4
Answer Key : Concept 4.1-4.2 Review
Question:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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Answer
C
B
B
B
A
C
A
D
A
D
D
B
C
C
A
B
A
A
B
A