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40 Cards in this Set
- Front
- Back
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Most pure basic substances
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elements
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Combined atoms are different _______.
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compounds
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tiny particles of elements
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atoms
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measures gravitational pull
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weight
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has no fixed shape or volume
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gas
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CO2
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carbon dioxide
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Chemist who developed the Periodic Table
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Mendeleev
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IUPAC
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authority which assigns names to elements
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last two rows on the Periodic Table
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rare earth elements
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elements to the left of the "stair-steps" in the periodic table.
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metals
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elements to the right of the "stair-steps" in the Periodic Table.
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nonmetals
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hold the secret to chemical change
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electrons
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path or orbit in which electrons whirl about the nucleus
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shell
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a common base
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baking soda
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water
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H2O
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All matter in the Universe consists of many substances called ________.
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chemicals
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Chemicals and _______ are not the same thing.
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elements
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On earth, the _____ of an object is almost exactly the same as its weight.
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mass
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The tiny particles of elements are called _____.
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atoms
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A molecule may contain two atoms of the same ______.
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element
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Neutrons are located in the ______ of an atom.
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nucleus
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______ ____ is a system of comparing atomic masses to carbon.
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Relative mass
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Many chemical symbols represent the _______ names of the elements
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latin
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Matter is material that takes up space and has ____.
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mass
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Your mas on the moon would be ______ it is on the earth.
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the same as
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Has a fixed volume but takes the shape of its container
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liquid
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Atoms are more than _____ times smaller than the thickness of human hair.
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a million
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The lightest chemical element is ______.
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hydrogen
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The number of protons plus the number of neutrons is the ______.
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atomic mass
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compounds that are electron pair acceptors.
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acids
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when acids and bases are mixed, thy _______ each other.
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neutralize
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the chemical symbol for hydrogen is
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H
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the chemical symbol for potassium is
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K
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The chemical symbol for helium is
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He
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the chemical symbol of oxygen is
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O
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the chemical symbol for lithium is
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Li
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the chemical symbol for sodium is
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Na
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the chemical symbol for neon is
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Ne
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the chemical symbol for calcium is
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Ca
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the chemical symbol for chlorine is
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Cl
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