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Question

# In Br how many protons and neutrons are present? write it's electronic configuration and valency

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Solution

## For Bromine the atomic number is 35. so number of protons = 35 In a neutral atom the number of protons = the number of electrons. 35 protons = 35 electrons. The atomic mass is the sum of the number of protons and the number of neutrons (as electrons weigh almost nothing) so Protons + neutrons = Atomic mass atomic mass of br is 80 35+n=80 to solve for n subtract 35 from both sides. 35−35+n=80−35 which gives n = 45. Therefore no of neutrons=45. All you need to do to find electronic configuration is work your way across the periodic table filling the orbitals as you go The full version of this is: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. Bromine is of halogen group and hence have 7 valence electrons hence valency is 7. Also from the electronic configuration we can see that outermost shell has 7 valence electron from 4s2 4p5 configuration. Read it carefully and try to understand everything carefully.Hope this will help you.

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