2.2.1

The element fluorine (F), chlorine (Cl), and Iodine (I) are all in the same column on the periodic table. Which is the BEST explanation for this arrangement?

• They are all gases at room temperature.

• They were all discovered in ancient times.

• They have the same number of energy levels.

• They have the same number of valence electrons.

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Why do carbon, silicon, and germanium share many chemical properties?

• They have the same atomic mass.

• They have the same atomic number.

• They have the same electron configuration.

• They have the same ratio of electrons to protons.

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On the periodic table, helium (He) is placed at the top of group 18 (8A). What is the reason for helium being at this location on the periodic table?

• Helium has a filled outer energy shell.

• Helium is a very reactive gas.

• Helium loses its electrons easily.

• Helium is a transition metal.

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Elements with the same valence electron configuration can be expected to have similar

• atomic mass

• chemical reactivity

• number of protons

• number of electrons

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Strontium, barium, and radium are grouped together on the periodic table of the elements because they all have

• a bright silver white coloring.

• similar electron configurations.

• strong radioactive properties.

• few or no stable isotopes.

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The noble gases, helium, neon, argon, krypton, xenon, and radon, rarely react with other elements because they

• are low-density gases.

• are not abundant on Earth.

• have complete outermost energy levels.

• have two electrons in their outermost energy level.

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Which one of the element groups is the most stable?

• group 13

• group 15

• group 17

• group 18

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Where in the periodic table are the most reactive non-metals found?

• nearer the upper left

• nearer the lower left

• nearer the upper right

• nearer the lower right

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Based off of the periodic trends, which metal is most likely the most reactive?

• lithium

• calcium

• cesium

• iron

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Boron is a Group IIIA metalloid. it is found in period 3 on the periodic table. What kind of element will a boron atom form to reach stability?

• +3

• -3

• +5

• -5

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