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 qualify, an IRA contribution can be a great way to reduce this year's taxes. For example, if you are in the 35 percent tax bracket and make a $5,500 contribution -- the maximum amount for 2014 -- you can save as much as $1,925 in taxes.Best of all, you can contribute to an IRA all the way until tax filing day, typically April 15.ake an IRA contribution. Contributions to a traditional individual retirement account can be tax-deductible in the year you make them. While IRS rules on IRA contributions vary, you can generally deduct the full amount of an IRA contribution if you and your spouse aren't covered by retirement plans at work.