1
Q
hydrogen
A
H
2
Q
carbon
A
C
3
Q
Helium
A
He
4
Q
Potassium
A
K
5
Q
Sodium
A
Na
6
Q
oxygen
A
O
7
Q
nitrogen
A
N
8
Q
aluminium
A
Al
9
Q
Boron
A
B
10
Q
zinc
A
Zn
11
Q
Tin
A
Sn
12
Q
phosphorus
A
P
13
Q
lead
A
Pb
14
Q
chlorine
A
Cl
15
Q
Silver
A
Ag
16
Q
Gold
A
Au
17
Q
Nickel
A
Ni
18
Q
Calcium
A
Ca
19
Q
Arsenic
A
As
20
Q
Neon
A
Ne
21
Q
a pure substance
A
elements
22
Q
what is the periodic table arranged by
A
atomic numbers
23
Q
A
