Which is the electron configuration for bromine?
a. 1s22s22p63s23p63d104s24p5
b. 1s22s22p63s23p63d104s24p6
c. 1s22s22p63s23p43d104s24p5
d. 1s22s22p63s23p64s24p5

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies. Bromine which has atomic number of 35 has 35 electrons and thus the electronic configuration will be:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

answer; 4 electrons;