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 you contribute to your traditional IRA by April 17th, you may be able to claim a tax deduction on your tax return for the amount contributed. Roth IRA contributions, however are not tax deductible since the qualified distributions are tax-free.You can contribute to your Roth IRA if your modified AGI is less than: 1  $179,000 for married filing jointly or qualifying widow(er),f youâre over 50, you get an additional $1,000 added to your contribution ($6,000/year). Donât forget that these are for individuals, so a couple younger than 50 can contribute $10,000 into IRAs ($5,000 each).