Periodic Table and Atoms

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

• silicone dioxide
• light
• mercury

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

• mercury
• silicone dioxide
• light

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; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.
• 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; spaces were left for elements not having the correct atomic mass.

Who organized elements into four groups based on properties

• Moseley
• Newlands
• Lavoisier
• Dobereiner

Who developed the law of octaves?

• Newlands
• Moseley
• Lavoisier
• Dobereiner

Who arranged the elements by atomic number

• Mendeleev
• Dobereiner
• Moseley
• Newlands

Who identified triads of elements with similar properties?

• Mendeleev
• Dobereiner
• Moseley
• Newlands

Who organized elements according to atomic mass

• Lavoisier
• Dobereiner
• Mendeleev
• Moseley

Which groups are part of the periodic table?

• metals, acids, ores
• flammable gases, ores, acids
• metals, nonmetals, conductors
• metals, nonmetals, semimetals

Which of these elements are you least likely to find in nature as a pure element?

• gold
• oxygen
• argon
• sodium