1.

If a uninegative ion has 10 neutrons and9 protons, electronicconfiguration of the atom ofthe element is

Answer»

2,8, 1
2, 7
2, 8
2,8 , 8

Solution : `X^(-) = 9` PROTONS (Z)
10 neutrons
10 electrons
`Xoverset(+1e^(-))toX^(-1)`(9 electrons)""(10 electrons)
Therefore , the electronic configuration of an atom is 2 , 7


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