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 group metals (PGMs) are rare precious metals with unique physical properties that are used in diverse industrial applications and in jewellery. Palladium, like gold, silver and platinum, is a precious metal, as well as one of the six PGMs, which also include platinum, rhodium, ruthenium, iridium and osmium. The unique physical characteristics of PGMs include: 1  Strong catalytic properties; 2  Excellent conductivity and ductility;