Question

what does the element iron have a variable valency sometimes Fe+2 and sometimes Fe+3​

Answer 1

Explanation:

Iron (Fe) has an atomic number of 26, i.e. has 26 electrons. The energy of 4s and 3d orbital is similar (4s has slightly higher energy). Also note that the 3d orbital has 1 electron pair, rest of the electrons are unpaired. ... When iron loses the 2 4s electrons, it attains a valency of +2.

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Answer 2

Answer:

Iron (Fe) has an atomic number of 26, i.e. has 26 electrons. ... Sometimes, iron will also lose one of the paired electrons from 3d orbital, leaving the entire 3d orbital filled with unpaired electrons (which provides a more stable configuration). In this case, its valency will be +3.

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