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  • Stage 1

    Answer 4 questions correctly in a row.

What is the name of this ionic compound?
N
H
4
I
Refer to a periodic table and a list of polyatomic ions.
Chemistry resources
1
2
3
4
5
6
7
Chemistry Legend for the periodic table.
1
1H
hydrogen
1.008
18
2He
helium
4.00
2
4Be
beryllium
9.01
3Li
lithium
6.94
13
5B
boron
10.81
14
6C
carbon
12.01
15
7N
nitrogen
14.01
16
8O
oxygen
16.00
17
9F
fluorine
19.00
10Ne
neon
20.18
12Mg
magnesium
24.30
11Na
sodium
22.99
13Al
aluminum
26.98
14Si
silicon
28.09
15P
phosphorus
30.97
16S
sulfur
32.06
17Cl
chlorine
35.45
18Ar
argon
39.95
3
21Sc
scandium
44.96
20Ca
calcium
40.08
19K
potassium
39.10
4
22Ti
titanium
47.87
5
23V
vanadium
50.94
6
24Cr
chromium
52.00
7
25Mn
manganese
54.94
8
26Fe
iron
55.85
9
27Co
cobalt
58.93
10
28Ni
nickel
58.69
11
29Cu
copper
63.55
12
30Zn
zinc
65.38
31Ga
gallium
69.72
32Ge
germanium
72.63
33As
arsenic
74.92
34Se
selenium
78.97
35Br
bromine
79.90
36Kr
krypton
83.80
39Y
yttrium
88.91
38Sr
strontium
87.62
37Rb
rubidium
85.47
40Zr
zirconium
91.22
41Nb
niobium
92.91
42Mo
molybdenum
95.95
43Tc
technetium
(98)
44Ru
ruthenium
101.07
45Rh
rhodium
102.91
46Pd
palladium
106.42
47Ag
silver
107.87
48Cd
cadmium
112.41
49In
indium
114.82
50Sn
tin
118.71
51Sb
antimony
121.76
52Te
tellurium
127.60
53I
iodine
126.90
54Xe
xenon
131.29
57-71lanthanidesDivider
56Ba
barium
137.33
55Cs
cesium
132.91
72Hf
hafnium
178.49
73Ta
tantalum
180.95
74W
tungsten
183.84
75Re
rhenium
186.21
76Os
osmium
190.23
77Ir
iridium
192.22
78Pt
platinum
195.08
79Au
gold
196.97
80Hg
mercury
200.59
81Tl
thallium
204.38
82Pb
lead
207.2
83Bi
bismuth
208.98
84Po
polonium
(209)
85At
astatine
(210)
86Rn
radon
(222)
89-103actinidesDivider
88Ra
radium
(226)
87Fr
francium
(223)
104Rf
rutherfordium
(267)
105Db
dubnium
(268)
106Sg
seaborgium
(269)
107Bh
bohrium
(270)
108Hs
hassium
(269)
109Mt
meitnerium
(277)
110Ds
darmstadtium
(281)
111Rg
roentgenium
(282)
112Cn
copernicium
(285)
113Nh
nihonium
(286)
114Fl
flerovium
(290)
115Mc
moscovium
(290)
116Lv
livermorium
(293)
117Ts
tennessine
(294)
118Og
oganesson
(294)
Lanthanides Symbol
Actinides Symbol
57La
lanthanum
138.91
58Ce
cerium
140.12
59Pr
praseodymium
140.91
60Nd
neodymium
144.24
61Pm
promethium
(145)
62Sm
samarium
150.36
63Eu
europium
151.97
64Gd
gadolinium
157.25
65Tb
terbium
158.93
66Dy
dysprosium
162.50
67Ho
holmium
164.93
68Er
erbium
167.26
69Tm
thulium
168.93
70Yb
ytterbium
173.05
71Lu
lutetium
174.97
89Ac
actinium
(227)
90Th
thorium
232.04
91Pa
protactinium
231.04
92U
uranium
238.03
93Np
neptunium
(237)
94Pu
plutonium
(244)
95Am
americium
(243)
96Cm
curium
(247)
97Bk
berkelium
(247)
98Cf
californium
(251)
99Es
einsteinium
(252)
100Fm
fermium
(257)
101Md
mendelevium
(258)
102No
nobelium
(259)
103Lr
lawrencium
(262)
Polyatomic ions
Name
Formula
Name
Formula
acetate
C
2
H
3
O
2
−
 or 
C
H
3
C
O
O
−
hydroxide
O
H
−
ammonium
N
H
4
+
hypochlorite
Cl
O
−
arsenate
As
O
4
3
−
iodate
I
O
3
−
azide
N
3
−
nitrate
N
O
3
−
bromate
Br
O
3
−
nitrite
N
O
2
−
carbonate
C
O
3
2
−
oxalate
C
2
O
4
2
−
chlorate
Cl
O
3
−
perchlorate
Cl
O
4
−
chlorite
Cl
O
2
−
periodate
I
O
4
−
chromate
Cr
O
4
2
−
permanganate
Mn
O
4
−
cyanide
C
N
−
peroxide
O
2
2
−
dichromate
Cr
2
O
7
2
−
phosphate
P
O
4
3
−
dihydrogen phosphate
H
2
P
O
4
−
phosphite
P
O
3
3
−
formate
H
C
O
2
−
 or 
H
C
O
O
−
sulfate
S
O
4
2
−
hydrogen carbonate or bicarbonate
H
C
O
3
−
sulfite
S
O
3
2
−
hydrogen phosphate
H
P
O
4
2
−
thiocyanate
S
C
N
−
hydrogen sulfate or bisulfate
H
S
O
4
−
thiosulfate
S
2
O
3
2
−

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