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Biology Chapter 2-1
Term | Definition |
---|---|
Matter | Anything that occupies space and has mass |
Mass | the quantity of matter and object has |
Element | substances that cannot be broken down chemically into simpler kinds of matter |
Atom | The simplest particle of an element that retains all of the properties of that element |
nucleus | the middle of the atom which consists of the protons and the neutrons |
proton | positively charged subatomic particle |
neutron | a subatomic particle that has no charge |
Atomic Number | the number of protons in an atom |
Mass Number | total number of protons and neutrons in an atom |
Electron | negatively charged particles |
orbital | a 3d region around the nucleus that indicates the probable location of an electron |
isotope | atoms of the same element that have a different number of neutrons |
compound | things made up of atoms of two or more elements in fixed proportions |
Chemical Bond | the attractive forces that hold atoms together |
Covalent Bond | something that forms when two atoms share one or more pairs of electrons |
Molecule | the simplest part of a substances that retains all of the properties of that substance and can exist in a free state |
ion | an atom or molecule with an electric charge |
ionic bond | when a positive and negative charge attract each other and end up creating a compound |