Chemistry Periodic Table Trends Pt. 2

Bromine is a period 4 element with one more proton than Selenium. Based on the graph above, what is the 1st ionization energy of Bromine?

• 750

• 770

• 1125

Hydrogen cyanide (HCN) is a colorless toxic gas. It smells like almonds. Write the correct lewis dot structure for hydrogen cyanide gas?

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Which statement best summarizes the group trend for density?

• As you move down a group, the density of elements increases.

• As you move down a group, the density of elements decreases.

• As you move across a period from left to right, the density of elements increases.

Which statement best describes a chemical property of aluminum?

• Aluminum is malleable.

• Aluminum is highly reactive when placed in sulfuric acid.

• Aluminum conducts an electric current.

As you move across a row on the periodic table from left to right, the force of attraction between the nucleus and the valence electrons...

• ...decreases because the distance between the nucleus and the valence electrons increases significantly.

• ...increases because the distance between the nucleus and the valence electrons decreases significantly.

• ...increases because the total charge of the nucleus increases.

How many valence electrons are used in drawing the Lewis structure for CO32-?

• 26

• 24

• 28