Chem 5.1 Part 1 Development of the Periodic Table

Which of the following elements was known to humans for thousands of years?

• Oxygen

• Copper

• Helium

• Neon

By the year 1700, how many elements had been identified?

• 10

• 13

• 20

• 25

Which scientist is credited with arranging elements based on their properties in the 1800s?

• Albert Einstein

• J. W. Dobereiner

• Isaac Newton

• Marie Curie

Explain why scientists in the 1700s and 1800s began organizing elements based on their properties.

• To create a new form of currency

• To better understand the relationships and patterns among elements

• To increase the number of known elements

• To prove the existence of atoms

What is a common feature of the methods used by Dobereiner, Newlands, and Mendeleev in organizing elements?

• They all used atomic numbers

• They all used patterns in the properties of elements

• They all used the color of elements

• They all used the density of elements

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Describe the significance of patterns in science using the example of the phases of the moon.

• Patterns help in predicting the future positions of the moon

• Patterns are used to determine the color of the moon

• Patterns are irrelevant in scientific studies

• Patterns are used to measure the distance between the Earth and the Sun

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Identify the scientist who is known for creating the first widely recognized periodic table.

• John Dalton

• John Newlands

• Dimitri Mendeleev

• Antoine Lavoisier

What challenge did chemists face when trying to isolate elements from their compounds before the 1700s?

• Lack of interest in chemistry

• Inability to identify elements

• Lack of technology to separate elements from compounds

• Elements were not present in compounds