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),
2014 Traditional & Roth IRA contribution limits. Total annual contributions to your Traditional and Roth IRAs combined cannot exceed: 1  $5,500 (under age 50). 2  $6,500 (age 50 or older).earn about the deadlines, income limits, and contribution limits for contributing to Traditional and Roth IRAs each year. Deadline for contributions for the 2014 tax year: April 15, 2015. 1  Contribute to your Fidelity IRA.Log In Required.