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),
A Roth IRA is an IRA that, except as explained below, is subject to the rules that apply to a traditional IRA. You cannot deduct contributions to a Roth IRA. If you satisfy the requirements, qualified distributions are tax-free.You can make contributions to your Roth IRA after you reach age 70 Â½.You can leave amounts in your Roth IRA as long as you live. The account or annuity must be designated as a Roth IRA when it is set up.The same combined contribution limit applies to all of your Roth and traditional IRAs.ou can leave amounts in your Roth IRA as long as you live. The account or annuity must be designated as a Roth IRA when it is set up. The same combined contribution limit applies to all of your Roth and traditional IRAs.