Symbols of 20 elements and their atomic number
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h 1
he 2
li 3
be 4
b 5
c 6
n 7
o 8
f 9
ne 10
na 11
mg 12
al 13
si 14
p 15
s 16
cl 17
ar 18
k 19
ca 20
he 2
li 3
be 4
b 5
c 6
n 7
o 8
f 9
ne 10
na 11
mg 12
al 13
si 14
p 15
s 16
cl 17
ar 18
k 19
ca 20
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