Page 54 - Chemistry eBook

1
H –1
Atomic Mass
12.011 –4
Selected Oxidation States Relative atomic masses are ba
2 3
4
5 6
Electron Configuration
Electron Configuration
KEY
1
ELECTRON CONFIGURATION: C
1
Periodic Table of the
1.00794 +1
12
+2 +4
Mg has 2 electrons in the first shell, 8 electrons in the second shell, and 2 electrons in the last shell Group
The Gnuromubper of electrons in each shell of an element
on
12
C = 12 (exact)
Peridodic Table on Reffy tells us the number of 6
Note: Numbers in parentheses are mass numbers of the most stable or common isotope.
Symbol
34
2-1 22.98977
2-2 +1
+1 40.08
7
Fr Ra Ac Rf Db Sg Bh Hs Mt Ds R
Na 11
3 4 5 6 7 8 9 10 11
2-8-1 39.0983
+2 44.9559 +3 47.867 +2 50.9415 +2 51.996 +2 +4 +4 +6
54.9380 +2 55.845 +2 +4
58.9332 +2 Co+3
2-8-15-2 102.906 +3
58.693 +2 63.546
+1 9.01218 +2
Atomic Number
6.941
electrons in each shell of an element 2-4 Li Be
24.305 +2
12
Mg
2-8-2
K Ca Sc Ti +3 V +3 Cr +3
Mn+3 Fe +3 25 +726
Ni+3 C
VALENCE SHELL: The last shell (or layer) of an atom
23 +524 2-8-8-1The va2l-8e-8n-2ce shel2l-8-o9-f2 an ato2m-8-10c-a2 nnot2h-8o-1l1d-2 more2-t8-h13a-n1
19
20 21 22
27
28
29
8 electrons. (We’ll learn more about this later.)
2-8-13-2 2-8-14-2 +6 (98) +4 101.07
2-8-16-2 106.42
2-8-18-1 +2 107.868
85.4678 +1 87.62 +2 88.9059 +3 91.224 +4 92.9064 +3 95.94
+3
+7
Rb Sr Y Zr Nb+5 Mo Tc+6 Ru
Pd +4 A 37 38 39 40 41 42 43 44 45 46 47
2-8-18-8-1 2-8-18-8-2 2-8-18-9-2 2-8-18-10-2 2-8-18-12-1 2-8-18-13-1 2-8-18-13-2 2-8-18-15-1 2-8-18-16-1 132.905 +1 137.33 +2 138.9055 +3 178.49 +4 180.948 +5 183.84 +6 186.207 +4 190.23 +3 192.217 +3
2-8-18-18 195.08 +2
2-8-18-18-8-1 2-8-18-18-8-2 2-8-18-18-9-2 *18-32-10-2 -18-32-11-2 -18-32-12-2 -18-32-13-2 -18-32-14-2 -18-32-15-2 -18-32-17-1 -18-32-18-1 (223) +1 (226) +2 (227) +3 (261) +4 (262) (266) (272) (277) (276) (281) (280)
+7
Cs Ba La Hf Ta W Re+6 Os+4 Ir +4
2-8-18-18-1 196.967
Pt +4
55 56 57 72 73 74 75 76 77 78 79
Rh
A
87 88 89 104 105 106 107 108 109 110 111g
E
s
u g u
Reference Tables for Physical Setting/Chemistry – 2011 Edition
54 © UNIT 2: ATOMIC STRUCTURE P eriod