Atomic Numbers and Electron Configurations

Question 1

Which of the following did Antoine Lavoisier correctly characterize as an element?

Revolt · Accepted Answer

C: mercury

Question 2

Which of the following did Antoine Lavoisier incorrectly characterize as matter?

Revolt · Accepted Answer

A: light

Question 3

Why did Mendeleev leave blank spaces in his version of the periodic table?

Revolt · Accepted Answer

C: Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

Question 4

Organized elements into four groups based on properties:

Revolt · Accepted Answer

A: Lavoisier

Question 5

Identified triads of elements with similar properties:

Revolt · Accepted Answer

B: Dobereiner

Question 6

From the list below, choose which groups are part of the periodic table.

Revolt · Accepted Answer

A: metals; D: nonmetals; E: semimetals

Question 7

Which of these elements are you least likely to find in nature as a pure element (that is, not combined with any other elements in a compound)? Use the periodic table to answer the question.

Revolt · Accepted Answer

D: sodium (Na)

Question 8

Rb:

Revolt · Accepted Answer

A: alkali metal

Question 9

Ca:

Revolt · Accepted Answer

B: alkaline earth metal

Question 10

Mg:

Revolt · Accepted Answer

B: alkaline earth metal

Atomic Numbers and Electron Configurations Answers

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