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),
* April 15 is the deadline for making annual contributions to a traditional or Roth IRA. Letâs discuss the contribution deadline first, and then the deadline for that first RMD (which affects only those IRA owners who turned 70Â½ last year).The earlier you make your annual IRA contribution, the better.You can make a yearly Roth or traditional IRA contribution anytime between January 1 of the current year and April 15 of the next year. So the contribution window for 2014 is January 1, 2014- April 15, 2015.You can make your IRA contribution for 2015 anytime from January 1, 2015-April 15, 2016.ou can make a yearly Roth or traditional IRA contribution anytime between January 1 of the current year and April 15 of the next year. So the contribution window for 2014 is January 1, 2014- April 15, 2015.