8.P.1.2

Who created the periodic table of elements?

• John Dalton

• Hennig Brand

• Antoine Lavoisier

• Dmitri Mendeleev

An element is identified by

• its number of protons.

• the atomic mass.

• the type of charge.

• its number of isotopes.

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NGSS.MS-PS1-1

Each of the elements in the periodic table has a specific number. What does this number represent?

• the half-life

• the number of neutrons

• the number of protons

• the number of isotopes

The number of protons and neutrons in the atom is its

• atomic mass.

• atomic number.

• atomic power.

• atomic clock.

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The element sodium appears like this in the periodic table. Which is its chemical symbol?

• 11

• Na

• sodium

• 22.990

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The chemical formula for baking soda is NaHCO₃. How many different elements make up baking soda?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

How are elements ordered in the modern periodic table?

• by date of discovery

• by decreasing atomic mass

• by increasing atomic number

• by alphabetical order of element symbols

The periodic table contains rows and columns. What are the horizon rows called?

• groups

• families

• columns

• periods

How many periods does the periodic table contain?

• 7

• 8

• 9

• 10

What are the columns of the periodic table called?

• periods

• rows

• tables

• groups or families