Qualifying Child. To be considered a qualifying child, your grandchild must be under the age of 19 on the last day of the tax year, or if he's a full-time student, under the age of 24.No age restrictions apply, however, if your grandchild is permanently and totally disabled.ualifying Child. To be considered a qualifying child, your grandchild must be under the age of 19 on the last day of the tax year, or if he's a full-time student, under the age of 24.
Platinum-iridium alloy. Platinum-iridium alloys are alloys of the platinum group precious metals platinum and iridium. Typical alloy proportions are 90:10 or 70:30 (Pt:Ir). These have the chemical stability of platinum, but increased hardness. The Vickers hardness of pure platinum is 56 HV while platinum with 50% of iridium can reach over 500 HV.
Platinum is a rare metal. Unlike other minerals, platinum is largely concentrated around a single geographical location in South Africa; among total 14 million ounces of platinum produced in 2002, 57% was produced in South Africa, followed by 31% in Russia, and lesser amounts in the United States and Zimbabwe.hus the price and availability of platinum has a major impact on the driving force for transportation. In this report, current usage and production of platinum is reviewed, and a prospect of future platinum supply versus demand is discussed.