Counting Atoms, Ions & Chemical Bonds
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23 Terms
Ions
positively and negatively charged atoms
Isotopes
Atoms of the same element that have different numbers of neutrons
Cation
A positively charged ion
Anion
A negatively charged ion
Chemical bonds are
the redistribution of electrons between atoms, leading to a more stable configuration
ionic bond
A chemical bond resulting from the attraction between oppositely charged ions.
Covalent bonds are
sharing of electrons between atoms
Law of Conservation of Matter
Matter is not created nor destroyed in any chemical or physical change but can be rearranged
chemical formula
shows the elements in the compound and the ratio of atoms
Reactants
a substance that takes part in and undergoes change during a reaction.
Products
the substances that are formed by the chemical change
subscript in chemical formula
small number below element symbol showing the quantity of atoms
Coefficient (chemistry)
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
balanced equation
a chemical equation in which mass is conserved; each side of the equation has the same number of atoms of each element
yields sign
The arrow in a chemical equation
Compounds (Chemical Compounds)
chemical substances consisting of atoms or ions of two or more elements in definite proportions, which cannot be separated by physical means
Molecules
Groups of two or more atoms held together by chemical bonds