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science 20

electron a negativley charged particle located in the region surrounding the nucleus of an atom
energy level a specific region surrounding the nucleus that is available for electrons
atomic number the number of protons in the nucleus of an atom
neutron a neutral particle located in the nucleus of the atom
mass number the total number of protons and neutrons in an atom
valence electron an electron that occupies the outermost energy level in an atom
proton a positivley charged particle located in the nucleus of an atom
cation a postivley charged ion
atomic mass the average mass of the atoms of an element including all isotopes
element a pure substance which cannot be broken down into simpler substances by chemical means
anion a negativley charged ion
atom the smallest part of an elemnt that has all the properties of that element
non metal an element that is not flexible does not conduct electricity and tends to form negative ions
ionic bond a bond formed by the simultaneous attraction between positive and negative ions
molecular compound a pure substance formed from non metals
metal a malleable and ductile element that has lustre has good heat and electrical conductivity and tends to form positive ions
molecule a particle containing a fixed number of covalently bonded non metals
ionic compound a pure substance formed from a metal and a non metal
covalent bond a bond formed by the simultaneous attraction of two nuclei for a shared pair of electrons
compound a pure substance formed from atoms of two or more elements with different atoms joined in fixed ratios
solute a substance that dissolves
exothermic change a chemical change in which energy usually in the form of heat is released into the surroundings
non electrolyte a solute in a solution that does not conduct electricity
solvent a substance in a solution that breaks down the bond of a solute
solution a homogeneous mixture of dissolved substances that contains a solute and a solvent
chemical change a change in which one or more new substances with different prperties are formed
dissociation the seperation of an ionic compound into individual ions in a solution
endothermic change a chemical change in which energy is absorbed from the surroundings
aqueous solution a solution in which water is the solvent
electrolyte a solute that forms a solution that conducts electricity
standard solution a solution having a precisley known concentration
mole a specific amount of a substancethat consists of 6.022 times 10 to the power of 23
acid a substance taht produces hydrogen ions when dissolved in water to form a conducting aqueous solution
molar concentration the amount of solute in moles per litre of solution
molar mass that mass of one of the mole of a substance
Created by: tessahughes