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In developing the periodic table, Dmitri Mendeleev predicted the existence and properties of an undiscovered element he called eka-silicon. Which element was later discovered that matched this prediction?
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4. Atoms and Elements
Periodic Table: Classifications
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Periodic Table: Classifications — Why isn’t water () on the periodic table?
A
Because water is a liquid at room temperature, and the periodic table only includes solids.
B
Because water is too common to be listed; only rare substances are included on the periodic table.
C
Because water contains ions and the periodic table only includes neutral atoms.
D
Because the periodic table lists chemical elements, and water is a compound made of hydrogen and oxygen.
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Understand that the periodic table is a chart that organizes all known chemical elements based on their atomic number, electron configurations, and recurring chemical properties.
Recognize that each entry on the periodic table represents a single element, which is a pure substance consisting of only one type of atom.
Know that water (H\_2O) is a compound, meaning it is made up of two or more different elements chemically bonded together—in this case, hydrogen and oxygen.
Since water is a compound and not a single element, it does not appear on the periodic table, which only lists individual elements.
Therefore, the correct reasoning is that the periodic table lists chemical elements, and water is a compound made of hydrogen and oxygen atoms bonded together.
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