Question
Asked Feb 13, 2020
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 What is the name given to group 7A

   

alkali metals 

   

alkaline earth metals

   

noble gases

   

halogens

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Expert Answer

Step 1

An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles are arranged in a certain way in the atom and provide electrical neutrality to the molecule. Electrons are placed in different energy levels of an atom.

Step 2

The long form of periodic table is the arrangement of all elements in the increasing order of their atomic number. In this table all known elements are placed in vertical columns which are called as groups and horizontal rows which are called as period.

Step 3

In the Long Form of Periodic Table, the groups and numbers are marked with numbers therefore there are 1st to 18th group which are also marked as 1A and 1B.

According to this marking 7 A group is 17th...

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