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Question 1

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

Revolt · Accepted Answer

B: which chemical properties they have

Question 2

Based on the information in the table, which elements are most likely in the same periods of the periodic table? Facts about Five Elements Element Atomic mass amu Total electrons Valence electrons Year isolated Aluminum Al 27 13 3 1825 Boron cap b 11 5 3 1808 Carbon cap c 12 6 4 1803 Gallium Ga 70 31 3 1875 Germanium Ge 73 32 4 1886

Revolt · Accepted Answer

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.

Question 3

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

Revolt · Accepted Answer

C: atomic mass.

Question 4

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?

Revolt · Accepted Answer

D: Phosphorus has a larger atomic mass.

Question 5

Based on the information in the table, which two elements are most likely in the same group, and why? Facts about Four Elements Element Atomic mass amu Total electrons Valence electrons Year isolated Bismuth Bi 209 83 5 1753 Nitrogen cap n 14 7 5 1772 Oxygen cap o 16 8 6 1772 Sodium Na 23 11 1 1807 Thallium Tl 204 81 3 1861

Revolt · Accepted Answer

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

Question 6

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

Revolt · Accepted Answer

A: Lavoisier and Mendeleev

Question 7

Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made. Which fact was most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table that helped Moseley develop his version?

Revolt · Accepted Answer

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

Question 8

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

Revolt · Accepted Answer

D: groups.

Question 9

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?

Revolt · Accepted Answer

A: directly to the right

Question 10

How many groups are in the modern periodic table?

Revolt · Accepted Answer

D: 18

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