Ch. 7-8 Notes
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 | is the smallest piece of an element that still represents that element
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| Electron | is a particle with one negative charge
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| Nucleus | most of an atom's mass and positive charge is concentrated in a small area in the center of the atom
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| Proton | is an atomic particle that has one positive charge
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| Neutron | is a neutral particle that exists in the nucleus of an atom.
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| Electron Cloud | is an area around an atomic nucleus where an electron is most likely to be located
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| Atomic Number | number of protons in an atom of an element
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| Isotopes | are atoms of the same element that have different numbers of neutrons. Most elements have several isotopes
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| Mass Number | is the sum of the number of protons and neutrons in an atom
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| Average Atomic Mass | is the average mass of the element's isotopes, weighted according to the abundance of each isotope
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| Ion | is an atom that is no longer neutral because it has gained or lost electrons
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| Metals | often shiny, good conductors of electricity and thermal energy: easily pulled into wires and hammered into sheets
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| Metalloids | have properties in common with both metals and nonmetals often used as semiconductors in electronic devices
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| Nonmetals | poor conductors of thermal energy and electricity, most are gases at room temperature: solid forms tends to be brittle
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| Chemical Bonds | is a force that holds two or more atoms together
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| Valence Electrons | is an outermost electron of an atom that participates in chemical bonding. These outermost electrons are the only electrons involved in chemical bonding
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| Electron Dot Diagram | a model that represents valence electrons in an atom as dots around the element's chemical symbol
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| Covalent Bond | is a chemical bond formed when two atoms share one or more pairs of valence electrons. The atoms then form a stable covalent compound.
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| Molecule | is a group of atoms held together by covalent bonding that acts as an independent unit
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| Chemical Formula | is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound
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| Ionic Bond | the attraction between positively and negatively charged ions in an ionic compound
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| Metallic Bond | is a bond formed when many metal atom share their pooled valence electrons
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
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.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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