Group VIIA elements periodicity

A column of the periodic table is called a family. Some families have special names. Group IA elements are called alkali metals, group IIA elements are called alkaline earth metals, group VIIA elements are called halogens, and group VIIIA elements are called the noble gases. The group B elements are called transition elements. Elements with atomic numbers from 58 to 71 are called lanthanides, and elements with atomic numbers from 90 to 103 are called actinides. Families have similar chemical and physical properties. For example, the alkali metals are soft metals at room temperature they are shiny, conduct... 

Halogens Group VIIA elements in the periodic table. 

Bromine is a Group VIIA element in Period 4. Deduce the valence-shell configuration of bromine. 

Chemical Properties. Organohydrosilanes undergo a wide variety of chemical conversions. The Si—H bond of organohydrosilanes reacts with elements of most groups of the Periodic System, especially Groups 16(VIA) and 17(VIIA). There are no known reactions if the Si—H bond is replaced by stable bonds of sihcon with elements of Groups 2(IIA), 13(IIIA), and 8—10(VIII). 

Cl is in periodic group VIIA, and so its maximum oxidation number is +7 and its minimum oxidation number is 7 — 8 = — 1. It also has an oxidation number of 0 when it is a free element. 

CAS 7726-95-6. Br. Nonmetallic halogen element of atomic number 35, group VIIA of the periodic table. Aw 79.904. Valences 1,3,5 (valence of 7 also reported). There are two stable isotopes. 

CAS 7553-56-2.1. Nonmetallic halogen element of atomic number53 group VIIA of the periodic table ... 

Figure 6-3 A plot of electron affinity versus atomic number for the first 20 elements. The general horizontal trend is that electron affinities become more negative (more energy is released as an extra electron is added) from Group lA through Group VIIA for a given period. Exceptions occur at the IIA and VA elements.

Physical and Chemical Properties Fluorine is a typical nonmetal of Group -VIIA of the Periodic Table of the elements, and has an electronic formula of 1 s 2 s 2p . Its atomic weight is 18.9984, and its highest negativity is —3.9. In its free state, fluorine exists as a molecule of F2... 

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