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bioterms
32143432
11
Biology
9th Grade
10/27/2014

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Term
Atom
Definition
It is the basic unit of matter.
Term
nucleus
Definition
It is in the center of an atom, which contains the protons in the neutrons; in cells, structure that contains the cell's genetic material in the form of DNA.
Term
electron
Definition
It is a negatively charged particle; located in the space surrounding the nucleus.
Term
element
Definition
It is a pure substance that consists entirely of one type of atom.
Term
isotope
Definition
It is one of several forms of a single element, which contains the same number of protons but different numbers of neutrons.
Term
compound
Definition
It is a substance formed by the chemical combination of two or more elements in definite proportions.
Term
ionic bond
Definition
it is a chemical bond formed when one or more electrons are transferred from one atom to another.
Term
ion
Definition
It is an atom that has a positive or negative charge.
Term
covalent bond
Definition
It is a type of bond between atoms in which electrons are shared.
Term
molecule
Definition
It is the smallest unit of most compounds that displays all of the properties of that compound.
Term
van der waals forces
Definition
It is the slight attractions that develops between oppositely charged regions of nearby molecules.
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