help please previous 6 of 10 The Octet Rule ResetHelp When main group elements r

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help please

previous 6 of 10 The Octet Rule ResetHelp When main group elements react, they tend to acquire eight outer-shell electrons (ns np). This is called an octet, and it is a particularly stable configuration. Group Valence To attain octet 1A nslose one electron 2A ns2 lose two electrons 3A ns np lose three electrons 5A ns p gain three electrons 6A ns np gain two electrons 7A n 8A ns2np6 rarely gain or lose electrons He Ne Ar Kr snp gain one electron Br Se Nonmetals in the third period and beyond can break the octet rule because they have vacant d orbitals that allow them to accommodate more than eight outer-shell electrons Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

He = 2 e-

Ne = 10 e-

Ar = 18 e-

Kr = 36 e-

then...

Be = 4 e-; it must lose 2 to form 2e- config --> He

N = 7e-; it must gain 3e- to form 10 e-; which is Neon

Mg --> 12 e-; it must lose 2 e- to form 10 e-; cwhich is Neon

S = 16 e-; must gain 2e- to form 18e-; argon

Al = 13 e-; must lose 3e- to form 10e-; Neon

Br = 35e-; must gain 1 e- to form 36e-; Krupton

Se = 34e-; must gain 2e- to form 36e-; Krypton

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