Physical Science Chapter 16

Elements on the far right of the periodic table are classified as nonmetals.

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Thompson's experiments led to the discovery of the neutron.

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The closer an electron is to the nucleus, the lower its energy.

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Every atom of the same element has the same atomic number.

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For an atom to be neutral, the number of protons must equal the number of neutrons.

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Matter always has mass.

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The central core of an atom is called the hub

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The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the periodic table.

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The mass of an electron is about equal to the mass of a proton.

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Elements arranged in vertical columns in the periodic table are called periods.

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