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),
Contribution Limits. As of 2013 you can contribute up to $5,500 each year to your Roth IRA, rising to $6,500 starting at age 50. You can make the full Roth contribution if you earn between $5,500 and $112,000 annually if single, or between $11,000 and $178,000 if married filing jointly.If income falls below or above these limits, you may be allowed to make a partial Roth contribution.ou can make the full Roth contribution if you earn between $5,500 and $112,000 annually if single, or between $11,000 and $178,000 if married filing jointly. If income falls below or above these limits, you may be allowed to make a partial Roth contribution.