Definitions
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Ion
Atom which has lost or gained electrons
isomer
Same molecular formula Different structural formula
Hydrocarbon
Compound containing only C and H
Acid
Solution containing a higher number of H+ aqueous ions than OH- aqueous ions
Molecule
2 or more atoms joined together by covalent bonds
Covalent bond
A shared pair of electrons
Isotope
Same atomic number Different mass number
Alkali
Solution with higher numbers of OH- aqueous ions than H+ aqueous ions
Atomic number
Number of protons in an atom
Fuel
A substance that burns to release energy
Combustion
Combining with oxygen to release energy
Valency
The number of unpaired of outer electrons
Element
Substance containing only one type of atom
Mass number
The sum of the number of protons and neutrons in an element
Solute
A substance that will dissolve in a liquid (water)
Diatomic
A molecule containing two atoms
What are the 7 diatomic elements
Iodine Hydrogen Nitrogen Bromine Oxygen Chlorine Fluorine
Electrolyte
An ionic solution used to complete an electrochemical cell
Exothermic
A reaction that releases energy
Endothermic
Reaction in which heat energy is taken in
What are the properties of protons
Charge : 1+ Mass: 1 a.m.u Found: in the nucleus
What are the properties of neutrons
Charge: 0 Mass: 1 a.m.u Found: in the nucleus
What are the properties of electrons
Charge: 1- Mass: 0 Found : in shells around nucleus
Period
Horizontal row of elements in the periodic table