Halogen (Periodic Table)

Halogen

The halogens in the periodic table include the six chemical elements of group 17: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Te). These elements have seven valence electrons.

Fluorine is the lightest element in halogens. In this group, four elements (fluorine, chlorine, bromine, and iodine) are reactive nonmetals, and astatine is a post-transition metal.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
– halogen

FAQs on Halogen

‣ Why group 17 is called halogens?

The elements of group 17 form salts when they react with metals, so group 17 elements are also known as halogens.
‣ Which halogen does not react with water?

The iodine element in the halogen group does not react with water.
‣ Which halogen is most reactive?

The fluorine element in the halogen group is the most reactive of all halogens.
‣ What period are halogens in?

The halogens are in period 2 to period 7 of the periodic table.
‣ Is carbon a halogen?

Carbon is a reactive nonmetal, not a halogen.
‣ Are halogens gases?

In the halogen group, two elements (iodine and astatine) are solid, one element (bromine) is liquid, and two elements (fluorine and chlorine) are gases at room temperature.
‣ Are halogens good conductors?

The halogens are not good conductors of electricity.
‣ Which halogen has the highest electron affinity?

The chlorine element in the halogen group has the highest electron affinity of all halogens.
‣ What group are halogens in?

All halogens are in group 17 of the periodic table.
‣ Where are halogens on the periodic table?

The halogens are on the left side of the noble gas group in the periodic table.
‣ What happens when halogens react with metals?

When halogens react with metals, they form salts.
‣ How many halogens are there?

There are a total of 6 halogens in the periodic table.
‣ Are halogens metals or nonmetals?

Except for astatine (At) and tennessine (Ts), all elements in the halogen group are nonmetals.

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