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),
Both traditional and Roth IRA contributions can qualify for the retirement savings credit. The credit is on top of any deduction you get for contributing and can be as high as 50 percent of up to $2,000 of contributions, but your modified adjusted gross income must fall below the annual limits.our traditional IRA contributions must be reported on your tax return using either Form 1040 or Form 1040A. You're always eligible to deduct your traditional IRA contributions, which reduces your taxable income, if neither you nor your spouse participates in an employer-sponsored retirement plan.