click below
click below
Normal Size Small Size show me how
Unit 3
Term | Definition |
---|---|
Atom | The smallest particle into which an element can be divided and still and still be the same element |
electrons | particles within the atom that have a negative charge |
nucleus | a small dense center of an atom that has a positive charge and is surrounded by moving electrons |
protons | positive charged particles in the nucleus |
neutrons | uncharged particles in the nucleus of an atom |
electron cloud | a region around the nucleus of an atom where electrons are likely to be found |
atomic number | the number of protons in the nucleus of an atom |
mass number | the total number of protons and neutrons in an atoms nucleus |
Periodic table | Periodic table An arrangement of elements on a table created by Dmitri Mendeleev |
Chemical symbol | An abbreviation of an elements name |
Average atomic mass | The weighted average of the masses of all the naturally occurring isotopes of that element |
group | Each vertical column of elements on the periodic table |
metal | Elements that are shinny and conduct heat and electricity well |
period | Each horizontal row of elements on the periodic table |
nonmetal | Elements that are poor conductors of heat and electricity |
meataloid | Elements that have some properties of metals and nonmetals |
Chemical bonds | an interaction that holds atoms or ions together |
Valence Electron | Electrons on the outermost energy level of an atom |
Ion | a particle with a negative or positive charge |
Molecule | A group of atoms held together by chemical bonds |
Ionic Bond | A force that brings oppositely charged ions together |
Corvalent Bond | Forms when atoms share one or more pairs of electrons |
Metallic Bond | Forms between metal atoms when their outermost energy levels overlap |