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Atoms and Molecules
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An atom that has gained of lost electrons is called
ion
Process that joins together different types of atoms is called ______
chemical change
The atomic symbols and numbers used to abbreviate the name of a compound is called ____
chemical formula
___________ molecules combine to form a new subtance
synthesis reaction
_______________ a compound breaks apart into two or more simpler compounds
decomposition reaction
The _____________ classifies elements in categories showing which elements possess siimilar characteristics and react similarly with other elements.
Pediodic table of the elements
Man who developed a classification system for elements is called
Dmitri mendeleev
Man who develop a simplified model of the atom is called ________
Niels Bohr
The ________________ of an atom is based on the number of protons in the nucleus.
atomic number
A row on the periodic table of elements is called a _______
period
A column on the periodic table of the elements is called a ________
group
The sum of the number of protons and neutrons results in an atom's approximate atomic ______
mass
The study of matter is ___ what it is made of, what its usual characteristics are, how it reacts to other matter is called _____
chemestry
The space that represents the average distance that electrons are from the nucleus is called a _______
shell
Protons and neutrons are found in the ________
nucleus
The three mian parts of an atom are __________
protons, neutrons, and electrons
Substances that have only one kind of atom are called __________
elements
The smallest recognizable piece of an element is an ___________
atom
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