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Chemistry Vocabulary

Teacher: Mrs. Headrick
A combination of two or more atoms that are bonded together.
The force that holds two atoms together.
A short, easy way to show a chemical reaction, using symbols instead of words.
A tiny, negatively charged, high-energy particle that moves in the space outside the nucleus of an atom.
A substance made of two or more elements chemically combined in a set ratio.
The number of protons added to the number of neutrons, which is most of the weight of the atom.
The vertical column of elements in the periodic table.
The number after an elements name, representing the sum of its protons and neutrons.
The set of characters that is used to identify an element.
Small, uncharged particle in the nucleus of an atom.
The electrons that are farthest away or most loosely held by the nucleus of an atom and are involved in chemical reactions.
The horizontal row of elements on the periodic table.
A characteristic of matter that can be observed or measured.
A number placed in front of a chemical formula in an equation, that indicates how many atoms each reactant and product take part in their reaction.
The material property that becomes evident in a chemical reaction
The smallest particle of matter.
The number of protons in the nucleus of an atom.
A table of the chemical elements arranged in order of atomic number, in rows, so that elements with similar atomic structure appear in vertical columns.
A small, positively charged particle in the nucleus of an atom.
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.
The central core of an atom containing protons and usually neutrons.