The element Mn has how many valence electrons? Please explain in detail why and how.

Expert Solution

Mn (Manganese) atomic number is 25.

Electronic configuration is 1s²2s²2p⁶3s²3p⁶4s²3d⁵

In generally octet configuration is stable. If element obeys the 2, 10, 18, 36… electrons that is stable due to zero group electronic configuration. Ar element is stable. Atomic number is 18 with 18 electrons. Therefore 25-18 = 7 electrons are valence electrons.

[Ar]4s²3d⁵

Therefore valence electrons are 7.

In generally valence electrons for transition metal are ns and (n-1)d electrons. these electrons only involved in bonding.

Therefore ns is 4s and (n-1) is 3d. then 4s and 3d electrons are valence electrons i.e. 2+5 = 7.

queen_honey_blossom answered 2 years ago

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