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),
Roth IRA. The contribution amount limits to a Roth IRA are the same as those to a traditional IRA. However, your eligibility to contribute to a Roth IRA depends on your income. You can make a full contribution to each Roth IRA as long as your working spouse makes less than $173,000 in 2012.At those levels of modified AGI, the contribution amount begins to phase out, and at $183,000 (2012) you are no longer eligible to make contributions.owever, whether you can deduct your contributions depends on a few other factors: 1  If the working spouse doesnât participate in an employer-sponsored retirement plan, he or she can deduct the full amount contributed to the spousal IRA, and there is no income limit restricting the deduction.