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  Hydrogen |
2 He  Helium |
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| 2 | 3 Li  Lithium |
4 Be  Beryllium |
5 B  Boron |
6 C  Carbon |
7 N  Nitrogen |
8 O  Oxygen |
9 F  Fluorine |
10 Ne  Neon |
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| 3 | 11 Na  Sodium |
12 Mg  Magnesium |
13 Al  Aluminium |
14 Si  Silicon |
15 P  Phosphorus |
16 S  Sulfur |
17 Cl  Chlorine |
18 Ar  Argon |
|||||||||||
| 4 | 19 K  Potassium |
20 Ca  Calcium |
21 Sc  Scandium |
22 Ti  Titanium |
23 V  Vanadium |
24 Cr  Chromium |
25 Mn  Manganese |
26 Fe  Iron |
27 Co  Cobalt |
28 Ni  Nickel |
29 Cu  Copper |
30 Zn  Zinc |
31 Ga  Gallium |
32 Ge  Germanium |
33 As  Arsenic |
34 Se  Selenium |
35 Br  Bromine |
36 Kr  Krypton |
|
| 5 | 37 Rb  Rubidium |
38 Sr  Strontium |
39 Y  Yttrium |
40 Zr  Zirconium |
41 Nb  Niobium |
42 Mo  Molybdenum |
43 Tc  Technetium |
44 Ru  Ruthenium |
45 Rh  Rhodium |
46 Pd  Palladium |
47 Ag  Silver |
48 Cd  Cadmium |
49 In  Indium |
50 Sn  Tin |
51 Sb  Antimony |
52 Te  Tellurium |
53 I  Iodine |
54 Xe  Xenon |
|
| 6 | 55 Cs  Caesium |
56 Ba  Barium |
72 Hf  Hafnium |
73 Ta  Tantalum |
74 W  Tungsten |
75 Re  Rhenium |
76 Os  Osmium |
77 Ir  Iridium |
78 Pt  Platinum |
79 Au  Gold |
80 Hg  Mercury |
81 Tl  Thallium |
82 Pb  Lead |
83 Bi  Bismuth |
84 Po  Polonium |
85 At  Astatine |
86 Rn  Radon |
||
| 7 | 87 Fr  Francium |
88 Ra  Radium |
104 Rf  Rutherfordium |
105 Db  Dubnium |
106 Sg  Seaborgium |
107 Bh  Bohrium |
108 Hs  Hassium |
109 Mt  Meitnerium |
110 Ds  Darmstadtium |
111 Rg  Roentgenium |
112 Cn  Copernicium |
113 Nh  Nihonium |
114 Fl  Flerovium |
115 Mc  Moscovium |
116 Lv  Livermorium |
117 Ts  Tennessine |
118 Og  Oganesson |
||
| 57 La  Lanthanum |
58 Ce  Cerium |
59 Pr  Praseodymium |
60 Nd  Neodymium |
61 Pm  Promethium |
62 Sm  Samarium |
63 Eu  Europium |
64 Gd  Gadolinium |
65 Tb  Terbium |
66 Dy  Dysprosium |
67 Ho  Holmium |
68 Er  Erbium |
69 Tm  Thulium |
70 Yb  Ytterbium |
71 Lu  Lutetium |
|||||
| 89 Ac  Actinium |
90 Th  Thorium |
91 Pa  Protactinium |
92 U  Uranium |
93 Np  Neptunium |
94 Pu  Plutonium |
95 Am  Americium |
96 Cm  Curium |
97 Bk  Berkelium |
98 Cf  Californium |
99 Es  Einsteinium |
100 Fm  Fermium |
101 Md  Mendelevium |
102 No  Nobelium |
103 Lr  Lawrencium |
|||||
| – 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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Related:
Also Read:
External Links:
- https://www.britannica.com/science/halogen
- https://en.wikipedia.org/wiki/Halogen
- https://chemed.chem.purdue.edu/genchem/topicreview/bp/ch10/group7.php
- https://www.thoughtco.com/halogen-elements-and-properties-606650
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.12%3A_Halogens
- https://chemistrytalk.org/halogens-periodic-table/
- https://flexbooks.ck12.org/cbook/ck-12-chemistry-flexbook-2.0/section/6.12/primary/lesson/halogens-chem/
- https://www.sciencedirect.com/topics/chemistry/halogen
- https://sciencenotes.org/halogen-elements-list-and-facts/
