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Periodic Table and Physical Change

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Across
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Elements in Group 17 that are highly reactive
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shine
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any change in the size, the shape, or the state of matter in which the identity of the substance is unchanged.
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Radioactive ________, when an unstable atomic nucleus changes into another nucleus by emitting one or more particles and energy.
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radioactive elements that are made by scientists in laboratories or created during nuclear reactions.
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Elements having only radioactive isotopes are classified as _____________ ___________.
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pure substance made from atoms that all have the same number of protons
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A nucleus that is unstable and undergoes radioactive decay is ____________.
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the collective properties of common metals
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horizontal row of elements on the Periodic Table
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the ability of a material to transfer electricity or thermal energy
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any characteristic of a material that can be observed without changing the identity of the material itself.
Down
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Group 18 elements that are extremely stable by themselves
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one of two or more atoms of an element having the same number of protons in their nuclei, but a different number of neutrons
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the ability of a material to transfer heat by collisions between its particles is ________ conductivity
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a giant machine that is capable of making particles move very fast.
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he time it takes for a sample of a radioactive isotope to decay to half its original mass.
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he ability of a material to transfer electric charges through a material is __________ conductivity
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The temperature at which a solid changes to a liquid
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The temperature at which a liquid changes to a gas
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When an atom of one element is changed into an atom of another element.
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the mass of an object divided by its volume
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vertical column of elements on the periodic table