AnswersReed Fall 2026 Physical Science 2nd Semester 7th HourPeriodic Table

Periodic Table Answers

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In an element’s square on the periodic table, the number with the greatest numerical value represents the

A
number of neutrons.
B
number of electrons.
C
atomic number.
D
atomic mass.
2
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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
3

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
4

This is how krypton appears in the periodic table.

Question illustration
A
36
B
48
C
84
D
120
5

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.
6

While looking at calcium (Ca) on the periodic table, a student needs to find an element with a greater atomic mass in the same period. Where should the student look?

A
directly up
B
directly down
C
directly to the left
D
directly to the right
7

How many groups are in the modern periodic table?

A
12
B
18
C
22
D
24
8

The element phosphorus is located to the right of the element magnesium along the same period in the periodic table.Which best describes the relationship of the elements?

A
Magnesium has a larger atomic number.
B
Phosphorus has a larger atomic mass.
C
Magnesium is in the same category as phosphorus.
D
Phosphorus has similar chemical properties as magnesium.
9

What are 1A, 3B, and 7A examples of on the periodic table?

A
groups.
B
numbers
C
periods
D
rows
10

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

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