chapter 7
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can also be used to determine the number of atoms present in a specific mass of an element
atomic mass

mass of a single atom of that element
atomic mass written under the symbol on the periodic table

sum of the atomic masses of all the atoms in its formula
formula mass

particles such as atoms, molecules, and ions are counted by the
mole

the unit of mole contains
6.022X10 to the 23 power items

the number of items in a mole, equal to 6.022X10 23 power
avogadros number

a group of atoms, molecules, or formula units that contain 6.022X10 23 power of items
mole

group of ions given by the formula of an ionic compound
formula units

quanitity in grams that equals the atomic mass of that element
molar mass

to determine the molar mass of a compound
muliply the molar mass of each element by its subscript in the formula and add the results

used to change from moles of a substance to grams or from grams to moles
molar mass

mass percent of each element present
percent composition

the actural or true formulas of compounds
molecular formulas

formula that represents the lowest wholenumber ration of the atoms in a compound
empirical formula

the percent by mass of the elements in a formula
percent composition

atom which forms the most bonds
central atom

 (dash)=
2 dots or 2 electrons

the ability of an atom to attract valence electrons
electronegativity

electronegativity of 0.51.7
polar

electronegativity of 00.4
nonpolar

electronegativity = to or greater than 1.8
ionic



sum of atomic mass (weight) of all atoms in its formula
formula mass

round addition and subtraction answersÂ to lowest number of
decimal places

round multiplication and division answers to lowest number of
sig figs

a unit that contains 6.022X10 to the 23 power number of items or particles (atom,moleculs, ions)
mole

given particlesfind number of moles
divide

given molesfind number of particle
multiply

contain two atoms
diatomic element

list the diatomic elements
 Hydrogen
 Nitrogen
 Oxygen
 Fluorine
 Chlorine
 Bromine
 Iodine