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),
You canât make a regular (non-rollover) contribution to a traditional IRA or a Roth IRA unless you or your spouse have qualifying income. This page explains what types of income count as qualifying income for this purpose.Reminder: Your IRA contribution or deduction may be limited by other rules: 1  You canât contribute to a regular IRA for the year you turn 70Â½ or any subsequent year.limony income. For purposes of making an IRA contribution, taxable alimony income counts as qualifying income. This is a special rule that permits you to build retirement savings in an IRA even if you rely on alimony income for your support.