The third-period elements can hold up up to 18 valence shell electrons. Apparently third-period elements can depart from the octet rule by having more than eight electrons in their valence shells. From the choices you have given, P, Cl, Se and Sn are all capable of having more than 4 pairs of valence electrons.his automatically eliminates carbon, oxygen, boron and fluorine. Tin will tend to form either a +2 or +4 ion, so that's eliminated. Chlorine is in the 3rd period, but because of it's high electronegativity, it will never be the central atom in a compound.
Amount of your reduced Roth IRA contribution. If the amount you can contribute must be reduced, figure your reduced contribution limit as follows. 1  Start with your modified AGI. 2  Subtract from the amount in (1): 3  $183,000 if filing a joint return or qualifying widow(er),f the amount you can contribute must be reduced, figure your reduced contribution limit as follows. 1  Start with your modified AGI. 2  Subtract from the amount in (1): 3  $183,000 if filing a joint return or qualifying widow(er),
If youâre married and you file a joint return, you can make a regular contribution to a Roth IRA even if you have little or no qualifying income. Solely for the purpose of determining how much you can contribute to an IRA, youâll be treated as if you had taxable compensation income equal to:1  Your qualifying income (if any), plus. 2  Your spouseâs qualifying income (if any), minus. 3  Your spouseâs regular contributions to traditional IRAs and Roth IRAs.f youâre married and you file a joint return, you can make a regular contribution to a Roth IRA even if you have little or no qualifying income. Solely for the purpose of determining how much you can contribute to an IRA, youâll be treated as if you had taxable compensation income equal to: