Report Abuse. X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3 Ã 1016 Hz to 3 Ã 1019 Hz) and energies in the range 120 eV to 120 keV.hen x-rays were first discovered, scientists didn't know much about them, so they called them X-rays because X in science is often used to designate an unknown as in Planet X or solve for X They were also sometimes called Rontgen Rays after the man who discovered them.
1. calcium ion-ion of calcium; a factor in the clotting of blood. factor IV. atomic number 20, Ca, calcium-a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals.. calcium ion-ion of calcium; a factor in the clotting of blood. factor IV. atomic number 20, Ca, calcium-a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals.
A calcium atom becomes a calcium ion by losing two electrons. Electrons are negatively charged, so losing two electrons creates an ion with a charge of 2+. According to the octet rule, atoms gain or lose electrons to fill their outer energy levels. This helps them achieve noble gas configuration. Calcium is atomic number 20 on the periodic table. Its nearest noble gas is argon, which has an atomic number of 18. To achieve argon's electron configuration, calcium needs to lose two electrons. When it does this, it becomes a positively charged ion. Although calcium is in the same period as the noble gas krypton, the calcium never attempts to attain krypton's electron configuration. This is because it takes less energy to lose two electrons than it would to gain six electrons and fill the outer energy level.