8th- Atomic Structure and the Periodic Table
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| atom | the smallest unit of an element
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| proton | a positively charged subatomic particle that is found in the nucleus and has a mass of 1 amu
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| neutron | a subatomic particle found in the nucleus that does not have an electric charge and has a mass of 1 amu
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| electron | a negatively charged subatomic particle that is found in the electron cloud surrounding the nucleus and has negligible mass
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| atomic mass | the sum of protons and neutrons in the atom
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| atomic mass unit (amu) | the unit in which the mass of one atom is expressed
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| isotope | an atom with a different number of neutrons and therefore a different atomic mass
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| electron cloud | the area around the nucleus where the electrons are; it is mostly empty space
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| orbitals | energy levels that electrons are arranged into
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| valence electrons | the electrons in the last shell that form chemical bonds with other atoms; they are responsible for giving the element its chemical properties
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| ion | an atom that has gained or lost an electron
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| compound | two or more elements bonded together
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| molecule | smallest piece of a compound
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| mixture | two or more substances physically combined
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| physical properties | describe traits or characteristics of matter, such as color
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| chemical properties | describes how an atom reacts or does not react to another
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| nucleus | what the center of an atom is called; where protons and neutrons are found
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| complete | describes an energy level or orbital that is full of electrons
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| atomic number | the name for the number of protons in an atom
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| period | a row in the Periodic Table
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| family | a group of elements with similar properties
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| neutral | overall charge of an atom
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| Lewis Structure | a diagram that includes only an element symbol and valence electrons
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| diatomic molecule | made of two identical atoms bonded together
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| pure substance | consists of only one kind of matter
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| element | the simplest form of matter
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| cation | an ion that has more protons than electrons, so it has a positive charge
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| anion | an ion that has more electrons than protons, so it has a negative charge
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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