click below
click below
Normal Size Small Size show me how
Chemistry Review
ESL
Term | Definition |
---|---|
Atom | the smallest particle of matter that has the properties of one element |
Electron | very small negatively charged particle found inside an atom |
Proton | positively charged particle found inside the atom's nucleus; has same mass as a neutron |
Neutron | particle with no charge found inside the atom's nucleus; has same mass as a proton |
Ion | an atom that has lost or gained one or more electrons; is charged |
Isotope | atoms with the same number of protons but different number of neutrons |
Valence | outermost shell electrons of an atom |
cation | positively charged ion |
anion | negatively charged ion |
compound | a pure substance made up of two or more different elements in a fixed ratio |
molecule | a cluster of atoms that stick together as one particle |
pure substance | |
mixture | |
homogeneous mixture | |
heterogeneous mixture | |
Particle Theory of Matter | |
Chemical Symbol | a single capital letter with or without a lowercase letter; represents one element |
Atomic number | number of protons in the atom's nucleus |
Atomic mass | number of protons and neutrons in the atom's nucleus |
Orbital shell = Energy level | where electrons are found inside an atom |
Nucleus | small dense center of an atom; where protons and neutrons are found |
Group (on Periodic table of Elements) | a vertical column on periodic table of elements; a family of related elements |
Period (on Periodic table of Elements) | a horizontal row on periodic table of elements |
Element | a type of pure substance that cannot be broken down chemically |
Chemical change | a process that changes the particles of matter by rearranging their atoms |
Physical change | a process that changes the physical properties of matter while keeping the particles the same |
Chemical formula | shows the number of atoms and types of elements in a compound |
Density | mass per volume |
neutral | no charge; equal number of electrons and protons |
precipitate | a new solid formed inside a solution of two liquids |