NBC 10 Unit 2 Review III

Shown above is the original periodic table that Dmitri Mendeleev proposed in the late 1860’s. Explain how Dimitri Mendeleev arranged the elements in the periodic table.  How does that arrangement differ from the periodic tables of today? Enter your answer and your explanation in the box provided.

Which element has the largest atomic radius? (Select ONE answer only)

• A

• B

• C

• D

Which group is known as the halogens?

• 1

• 2

• 17

• 18

The Group 17 element with the highest electronegativity is —

• A. fluorine.

• B. bromine.

• C. chlorine.

• D. iodine

A new element is discovered. This element shows very little reactivity with any other element on the Periodic Table, and it exists as a gas at room temperature. Determine which group would be the best classification for this new element. (Select ONE answer

• Alkali Metals

• Halogens

• Noble Gases

• Transition Metals

What atom matches this electron configuration?
1s² 2s² 2p⁶ 3s²

• Neon
• Magnesium
• Aluminum
• Potassium

What is the correct Lewis Dot Structure for ammonia NH3

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