Considere as seguintes afirmativas sobre dois elementos químicos genéricos x e y
.X tem número de massa igual a 40
X é isóbaro de Y
y tem número de elétrons igual a 20
Determine o número atômico e a distribuição eletrônica para o cátion bivalente (carga +2) de Y

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Answer: 1s²  2s²  2p⁶explanation: from the periodic table, we can note that the neutral fluorine  has 9 electrons (symbol is shown in the attached image)therefore, the configuration of neutral fluorine  is: 1s²  2s²  2p⁵now, f⁻  means that the neutral fluorine  gained one extra electron. this means that f⁻  has 10 electrons.the extra electron will occupy the 2p level to make it complete.the configuration now  is: 1s²  2s²  2p⁶comparing between both f and f⁻, we can note that f⁻  has now complete orbitals which means that it is more stable than f based on lewis postulatehope this : )

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