Answers MO-Physical Science A-CRPeriodic Table

Periodic Table Answers

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

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.

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.

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.”

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.

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

number of neutrons.

number of electrons.

atomic number.

atomic mass.

This is how krypton appears in the periodic table.

120

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

how many protons and neutrons they have

which chemical properties they have

how many total electrons they have

which period they are most often found in

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

Lavoisier and Mendeleev

Döbereiner and Newlands

Newlands and Mendeleev

Lavoisier and Döbereiner

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?

Magnesium has a larger atomic number.

Phosphorus has a larger atomic mass.

Magnesium is in the same category as phosphorus.

Phosphorus has similar chemical properties as magnesium.

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

bismuth and thallium, because their atomic masses are very similar

nitrogen and oxygen, because they were both first isolated in the same year

sodium and thallium, because their names both end in the same suffix: -ium

bismuth and nitrogen, because they have the same number of valence electrons

Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made.

Atomic mass is the average mass of different samples of the same element.

Different elements can have similar chemical properties even if their atomic masses are different.

The number of protons in an atom is different than the atom’s total mass.

Protons strongly affect an element’s atomic mass, while the electrons in atoms do not.

This is how zirconium appears in the periodic table.

131

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

groups.

numbers

periods

rows

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Periodic Table Answers

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