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How do you write the noble-gas electron configuration for bromine?

Answer
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Hint First, we have to write the noble gas configuration for bromine as its atomic number is 35 which means there are 35 electrons in the bromine atom so, arrange the electrons according to the increasing energy of the orbitals. Then write the noble-gas which comes before the bromine and write the rest of the configuration.

Complete step by step answer:
Bromine is the element of group 17 of the p-block and comes in the fourth period. So, its atomic number is 35 which means the number of protons and the number of electrons is 35 in the atom.
There are many orbitals that are placed according to their increasing order of energies. The order is1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p. And we know that the s-orbital can accommodate only 2 electrons, the p-orbital can accommodate 6 electrons, the d-orbital can accommodate 10 electrons, and the f-orbital can accommodate 14 electrons. So, the 35 electrons will be arranged as:
1s22s22p63s23p64s23d104p5
So, this is the ground state electronic configuration therefore, to write the noble-gas electron configuration we have to find the noble gas which comes before the bromine. From the periodic table the noble gas that is before bromine is Argon and the atomic number is 18, so its electronic configuration will be:
1s22s22p63s23p6
For this configuration in the bromine, we can write [Ar] and then the rest of the

configuration so, the noble-gas electron configuration for bromine will be:
[Ar]4s23d104p5

Note: All the noble gas with their atomic number are helium having the atomic number 2, neon having atomic number 10, argon having atomic number 18, krypton having atomic number 36, xenon having atomic number 54, and radon having atomic number 86.
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