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How many electrons are there in Br ?

Answer
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Hint: To find the number of electrons in Br, you should first know that how many electrons are present in bromine and then, add one electron in it and then, those resultant number of electrons will be present in Br. Now you can easily answer the statement.

Complete Solution :
- Bromine is a gas which comes under the category of halogens and belongs to the p-block elements of the periodic table.
- It lies in the 17th group and 4th period of the periodic table.
- It has an atomic number as 35 and the mass number as 80. It has the electronic configuration as: 3d104s24p5.
- Bromine has seven electrons in its outermost valence shell and has a strong tendency to gain one electron to acquire the fully filled electronic configuration of the nearest noble gas i.e. krypton.
Now considering the statement as:
- The number of electrons present in an atom is always equal to the atomic number of that very element.
- So, therefore, the number of electrons present in bromine = 35.
Since, Br carries negative charge i.e. it means it has gained one electron to complete its octet.
Thus, the total number of electrons present in Br = 35+1=36.

Note: Bromine being a halogen has seven electrons in its outermost shell and requires only one electron to complete its octet. So, bromine has a strong tendency to gain one electron from the other electron donating species and thus, it acts as a strong Lewis acid.