mononuclidic element 

Statements about this table:
scandium be the element with the highest z (p) when the n (n) be less than 30
the nuclide 89 y have an isotopic mass (u) of 88.905 (2)
when a nuclide be 89 y it have an isotopic mass below 88.905 85 (2)
when the nuclide be 55 mn the element be cobalt
element
nuclide
z ( p )
n ( n )
isotopic mass ( u )
beryllium
9 be
4
5
9.012 182 (3)
fluorine
19 f
9
10
18.998 403 2 (5)
sodium
23 na
11
12
22.989 770 (2)
aluminium
27 al
13
14
26.981 538 (2)
phosphorus
31 p
15
16
30.973 761 (2)
scandium
45 sc
21
24
44.955 910 (8)
manganese
55 mn
25
30
54.938 049 (9)
cobalt
59 co
27
32
58.933 200 (9)
element
nuclide
z ( p )
n ( n )
isotopic mass ( u )
arsenic
75 as
33
42
74.921 60 (2)
yttrium
89 y
39
50
88.905 85 (2)
niobium
93 nb
41
52
92.906 38 (2)
rhodium
103 rh
45
58
102.905 50 (2)
iodine
127 i
53
74
126.904 47 (3)
caesium
133 cs
55
78
132.905 45 (2)
praseodymium
141 pr
59
82
140.907 65 (2)
element
nuclide
z ( p )
n ( n )
isotopic mass ( u )
terbium
159 tb
65
94
158.925 34 (2)
holmium
165 ho
67
98
164.930 32 (2)
thulium
169 tm
69
100
168.934 21 (2)
gold
197 au
79
118
196.966 55 (2)
bismuth
209 bi
83
126
208.980 38 (2)
thorium
232 th
90
142
232.038 1 (1)
protactinium
231 pa
91
140
231.035 88 (2)