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| the smalest particles of an elementthat have the properties of that element; consist of electrons, protons, and neutrons |
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| Atomic Mass (mass number) |
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| how many units of positive charge in the nucleus |
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| the number of protons in the necleus of an atom; thenumber that identifies an element |
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| the study of chemicals and elements |
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| substance made of two or more kinds of atoms combined in different proportions |
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| substances made entirely of one kind of atom |
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| electrons negatively charged particles found in the spaces outside the nuclei of atoms have much less mass than protons or neutrons |
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| atoms that differ from other atoms of the same element by number of neutrons in their nucleus |
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| neutrons are neutral. pprotns and new trons have about the same mass |
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| in a eukaryotic cell, al large membrane - enclosed organelle that copntains the cell's dna ; in an atom |
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| positively charged particles found in the nuclei of all atoms have roughly thesame same mass as neutrons |
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| during emmssion, the atom changes to another isotope of a different element |
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| insturments sensitive to radiation can detect and measure the radioactivity given off by radioactive isotopes |
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| the sharing of a pair of electrons by two atoms creates a force of attraction that holds the atoms together |
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| a written representation of a compound in which symbol replaces each element |
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| the process of which chemical bonds are broken and the atoms form new bonds , producing replaces each statement |
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| a chemical bond that is formed by the sharing of electrons |
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| a hydrogen atom will react with another hydrogen atom to form a molkecule is made up of 2 hydrogen atoms |
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Definition
| an atom that has an excess charge |
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| the force of attraction between 2 ions that form are attracted to each other |
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| law of conservation of mass |
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Definition
| mas can neither be created or destroyed |
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| a particle of this kind in which two or more atoms are combined and as as a single particle |
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| the new produced by the reaction |
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| the substances that were present before the reaction started |
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| is a kind of chemical formula it shows not only the number and kind of atoms in molecule but also how the other atoms are bonded |
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| in an suspension the particles are large enough to give the liquid a cloudy appearance and the force of gravityt gradually causes them to settle out of the solvent |
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| it is possible , however , form many substances to be physically mixed without forming new chemical bonds |
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| other substances which are dissolved in the solvent |
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| although many homogeneneous mixture can be usually used for liquid mixtures |
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| the liquid substances that makes up the bulk of the solutution |
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| the mixture that seperates on standing |
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| is any compound that produces hydrogen ions in solution |
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| when dissolved in water a substances |
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| a substance that changes color when the pH goes or below a certain value |
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Definition
| the process reacting an acid and a base to produce a neutral solution |
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| the H+ concentration is indicated by a unit of measure |
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Definition
| the ionic compound produced by the neutralization reactons between an acid and a base |
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