AnswersMO-Physical Science A-CRPeriodic Table

Periodic Table Answers

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Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

A
how many protons and neutrons they have
B
which chemical properties they have
C
how many total electrons they have
D
which period they are most often found in
2
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Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made.

A
Atomic mass is the average mass of different samples of the same element.
B
Different elements can have similar chemical properties even if their atomic masses are different.
C
The number of protons in an atom is different than the atom’s total mass.
D
Protons strongly affect an element’s atomic mass, while the electrons in atoms do not.
3

Based on the information in the table, which elements are most likely in the same periods of the periodic table?

Question illustration
A
Boron and carbon are likely together in one period because they have very close atomic masses, while gallium and germanium are likely together in another period because they have very close atomic masses.
B
Aluminum, boron, and carbon are likely together in one period because they were first isolated in the first half of the 1800s, while gallium and germanium are likely together in another period because they were first isolated in the second half.
C
Boron and carbon are likely together in one period because they each end in “-on,” while aluminum, gallium, and germanium are likely together in another period because they each end in “-ium.”
D
Aluminum, boron, and gallium are likely together in one group because they have the same number of valence electrons, and carbon and germanium are likely together in another group because they have the same number of valence electrons.
4

How many groups are in the modern periodic table?

A
12
B
18
C
22
D
24
5

This is how krypton appears in the periodic table.

Question illustration
A
36
B
48
C
84
D
120
7

Which two chemists organized elements based on properties such as how the elements react or whether they are solid or liquid?

A
Lavoisier and Mendeleev
B
Döbereiner and Newlands
C
Newlands and Mendeleev
D
Lavoisier and Döbereiner
8

Based on the information in the table, which two elements are most likely in the same group, and why?

Question illustration
A
bismuth and thallium, because their atomic masses are very similar
B
nitrogen and oxygen, because they were both first isolated in the same year
C
sodium and thallium, because their names both end in the same suffix: -ium
D
bismuth and nitrogen, because they have the same number of valence electrons
10

This is how fluorine appears in the periodic table.

Question illustration
A
the atomic number
B
the atomic mass
C
the mass of neutrons
D
the number of neutrons

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