7Do the Atomic Structure Worksheet Name of ElementSymbol of ElementAtomic NumberAtomic MassNumber of ProtonsNumber of ElectronsNumber of NeutronsK35AlLi128Ni1018Gold11Pb
8Potassium K 19 39 20 Bromine Br 35 80 45 Aluminum Al 13 27 14 Lithium Name of ElementSymbolAtomic NumberAtomic MassNumber of ProtonsNumber of ElectronNumber of NeutronsPotassiumK193920BromineBr358045AluminumAl132714LithiumLi374MagnesiumMg1224OxygenO816NickelNi285931NeonNe10ArgonAr184022GoldAu79197118SodiumNa1123LeadPb82207125
9Chemical Formulastell you which elements are present in a compound, and their amountEach new element is denoted by a CAPITAL LETTER.NaCl = sodium and chlorineMgBr =magnesium and bromine
10The subscript (the small number slightly below the line) tells you how many atoms are present – that number only applies to the element at the immediate left of the number.
12Coefficients are large numbers written in front of the compound symbol Coefficients are large numbers written in front of the compound symbol. This tells you how many molecules of that compound you have.
13Ex. 5NaNO3 = 5 Na atoms 5 N atoms 15 O atoms 4NH4ClO3 = 4 N 16H 4 Cl 12 O
14Brackets around a complex ion, with a number to the immediate right of the brackets, tells you how many of that complex ions you have in the compound. That number applies to all elements inside the bracket.
17Do the Reading Chemical Formula Worksheet Number of Different Types of AtomsNames of Each atom presentNumber of each type of atomTotal Number of Atoms presentNumber of molecules of this compoundEx. 2NaCl2SodiumChlorine2 sodium2chlorine43N2O32KHCO35FeSO3C6H12O63K2Cr2O7CH3COOHMg(OH)23 Al(OH)34CuClO3
18Potassium Hydrogen Carbon Oxygen 2 Potassium 2 Hydrogen Chemical FormulaNumber of Different Types of AtomsNames of Each atom presentNumber of each type of atomTotal Number of Atoms presentNumber of molecules of this compoundEx. 2NaCl2SodiumChlorine2 sodium2chlorine43N2O3NitrogenOxygen6 N9O1532KHCO3Potassium Hydrogen Carbon Oxygen2 Potassium 2 Hydrogen2 Carbon 6 Oxygen125FeSO3Iron Sulphur Oxygen5 Iron 5 Sulphur 15 Oxygen255C6H12O6Carbon Hydrogen Oxygen6 Carbon 12 Hydrogen 6 Oxide241
19Potassium Chromium Oxygen 6 Potassium 6 Chromium 21 Oxygen 33 Chemical FormulaNumber of Different Types of AtomsNames of Each atom presentNumber of each type of atomTotal Number of Atoms presentNumber of molecules of this compound3K2Cr2O73Potassium Chromium Oxygen6 Potassium 6 Chromium 21 Oxygen33CH3COOHCarbon Hydrogen Oxygen2 Carbon 4 Hydrogen 2 Oxygen81Mg(OH)2Magnesium Oxygen Hydrogen1 Magnesium 2 Hydrogen 2 Oxygen53 Al(OH)3Aluminum Oxygen Hydrogen3 Aluminum 9 Oxygen 9 Hydrogen214CuClO3Copper Chloride Oxygen4 Copper 4 Chloride 12 Oxygen204
20Study for Quiz! Atomic Structure worksheet Reading Chemical Formula WorksheetModels of Molecules
21Drawing Bohr Diagrams of Atoms The nucleus contains all the protons and neutrons.Consequently, all the mass is concentrated in the nucleus. The electrons are arranged in specific ORBITALS around the nucleus.
22Orbital LimitsThere is a specific limit to how many electrons an orbital (or shell) can hold.Within the orbitals, the electrons like to spread themselves out.
28Example: Chlorine Atomic # = ______ Atomic Mass = ______ 17Atomic # = ______Atomic Mass = ______# protons = ______# neutrons = ______# electrons = ______Now do the worksheet:“Models of the elements”36171917
29The Valence Shell Definitions: 1) Valence Shell: the outermost orbital (or shell)2) Valence Electrons: _electrons in the outside shellThe Valence Shell
30The Valence Electrons are involved in forming bonds with other atoms The Valence Electrons are involved in forming bonds with other atoms. The inner electrons and nucleus are not involved in bonding.
38Example 2: Neonatomic # = _10____mass = ___20__#p = __10___#n = __10___#e = __10___# valence e = __8___Will this atom gain or lose? __neither___How many ? ___0____What is its combining capacity? _0_____Charge ? __0____Atoms with C.C. =_0=_INERT (NOBLE)_that is , they will not blow up! (or react at all!)
39Now go back and answer the questions on the Bohr diagram worksheets! Charge:Atoms are neutral if #p+ = # e-If atoms gain or lose electrons they become _charged = IONS!_.Now go back and answer the questions on the Bohr diagram worksheets!
40When naming NON-METAL ions, _change__ the name _ending_ to “_ide___” e.g. _oxygen___ = __oxide_________fluorine___ = _fluoride
41Non-metals form _negative ions. (_#e- > #p+)Metals form _positive_ ions.(_#e- < #p+)