Elements, Compounds, and Mixtures Answers

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

light

silicone dioxide

mercury

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

light

silicone dioxide

mercury

: As

Answer:

arsenic: As

: K

Answer:

potassium: K

tin:

Answer:

yttrium:

Answer:

: Yb

Answer:

ytterbium: Yb

: atomic number 15

Answer:

phosphorus: atomic number 15

: atomic number 45

Answer:

rhodium: atomic number 45

osmium: atomic number

Answer:

magnesium: atomic number

Answer:

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

Mendeleev’s periodic table arranged elements in order of increasing atomic mass; spaces were left for elements not having the correct atomic mass.

Mendeleev’s periodic table arranged elements in groups of similar chemical properties; spaces were left for elements not having a similar chemical property.

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.

Use the periodic table to identify the chemical symbol or name for each element below.zirconium:

Answer:

magnesium: atomic number

Answer:

rhenium:

Answer:

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