an element presented as x x and its isobar is 15 and 31 write the electronic configuration number of proton and number.
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Answer: isobar has same number of atomic mass but different atomic number
phosphorus atomic no. 15. its electronic configuration is 2, 8, 5
It has 15 proton because atomic mass is equals to proton and electron
31 electronic configuration is 2,8, 18,3
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