​the total weight of an atom 


the production of complex substances from simple living organisms​



atomic weight​


​biosynthesis

​an organic compound consisting of amine and carboxylic acid


​amino acids


a chemical bond where one atom gives up an electron to form a positive ion, and the other atom gains an electron to form a negative ion​
One of two or more atoms whose nuclei have the same number of protons and a different number of neutrons​



ionic bond​

isotope

​the number of protons
found in the nucleus of an atom


​atomic number
atoms or groups of atoms with unpaired number of electrons​


​the amount of time it takes for half of a substance to undergo a specific process


free radical ​




​half-life


​an atom with an uneven electrical charge due to the loss or gain of one or more electrons

ion

​ a large molecular chain-like structure that is made up of smaller
molecules called 
monomers

the chemical process that combines several monomers to create a polymer​




​polymer

polymerization ​

​a single molecule that can link together with another single molecule to form a polymer



​monomer

the smallest part of a compound that can exist by itself​


​a negatively charged particle


molecule​


​electron

the center of the atom that contains protons and neutrons


nucleus​

​a substance that contains molecules and atoms, occupies space, and has mass



the smallest part of an element that contains a positively charged nucleus and is surrounded by a system of electrons

​matter



​atom
​amino acid polymers that help in the growth and repair of cells



​protein

a pure substance that cannot be broken down into a simpler form

a subatomic particle in the nucleus of the atom that has a positive and negative charge, which makes it neutral



​element

neutron​


a nuclear reaction where a neutron splits an atomic nucleus into two smaller 
atoms

nuclear fission 

​a strong force that holds subatomic particles of the nucleus together
a nuclear reaction that releases radiation from an unstable material 


nuclear force​


radioactive​

​the study of how matter is made, its characteristics, and how it works under certain conditions

chemistry​

a positively charged particle


proton



Science:  Composition of Matter - Flashcards
Use the flashcards to help you memorize the following terms and definitions. Then try the worksheets shown on the Science Homepage. Once you are ready to quiz yourself, click the Quiz link.