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PERIODIC TABLE
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87
223
Francium
Group
Summary
Atomic Number
Symbol
Protons
Neutrons
Electrons
Mass Units
Melting Point
Boiling Point
Discovered by
88
226
55
132.91
56
137.33
37
85.468
38
87.620
19
39.098
20
40.078
11
22.990
12
24.305
3
6.9410
4
9.0122
1
1.0078
89
227
57
138.91
39
88.906
21
44.956
104
267
72
178.49
40
91.224
22
47.867
105
262
73
180.95
41
92.206
23
50.942
106
269
74
183.84
42
95.950
24
51.996
107
264
75
186.21
43
98
25
54.938
108
76
190.23
44
101.07
26
55.845
109
278
77
192.22
45
102.91
27
58.933
110
281
78
195.08
46
106.42
28
58.693
111
282
79
196.97
47
107.87
29
63.546
112
285
80
200.59
48
112.41
30
65.380
113
286
81
204.38
49
114.82
31
69.723
13
26.982
5
10.811
114
289
82
207.20
50
118.71
32
72.640
14
28.086
6
12.011
115
83
208.98
51
121.76
33
74.922
15
30.974
7
14.007
116
293
84
209
52
127.60
34
78.960
16
32.065
8
15.999
117
294
85
210
53
126.90
35
79.904
17
35.453
9
18.998
118
86
222
54
131.29
36
83.798
18
39.948
10
20.180
2
4.0026
58
140.12
59
140.91
60
144.24
61
145
62
150.36
63
151.96
64
157.25
65
158.93
66
162.5
67
164.93
68
167.26
69
168.93
70
173.04
71
174.97
90
232.04
91
231.04
92
238.03
93
237.05
94
244
95
243
96
247
97
251
99
252
100
257
101
258
102
259
103