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2.1
Term | Definition |
---|---|
matter | anything that occupies space and has mass |
mass | the quantity of matter an object has |
elements | substances that cannot be broken down chemically into simpler kinds of matter |
atom | the simplest particle of an element that retains all the properties of that element |
nucleus | the central region of a cell |
proton | positively charged particles |
atomic number | the number of protons in an atom |
mass number | equal to the total number of protons and neutrons |
electrons | negatively charged particles |
orbital | a three-dimensional region around the nucleus that indicates the probable location of an electron |
isotopes | atoms that have a different number of neutrons |
compounds | atoms of two or more elements in fixed proportions |
chemical bonds | the attractive forces that hold elements together |
molecule | the simplest part of a substance that retains all the properties of that substance and can exist in a free state |
covalent bond | when two atoms share one or more pairs of electrons |
ion | an atom or molecule with an electric charge |
ionic bond | when positive and negative electrical charges attract and form a compound |