isotopes

An isotope of Uranium has a half life of 1000 years. What is the percentage of original sample left after 5 years? => 99.121 or 99.500 or 99.875 or 99.654 or 99.424..

A nuclide is any species of atom of which each atom has an identical proton number and also an identical nucleon number. Different nuclides, which have the same proton number (but different nucleon numbers) are called isotopes (isotopic nuclides..

Cl - 35.5Cu - 63.5The fractional atomic masses of elements are due to the existence of isotopes having different mass..

Later on, an atom of oxygen was preferred as standard by taking its mass as 16 units. In 1961, the international union of chemists selected the most stable isotope of carbon (C-12 isotope) as standard for comparison. For example, if 1 atom of Na weights as much as 23 parts of 1..

Hydrogen atom (Z = 1) has no neutrons. Number of protons = 1Number of electrons = 1Number of neutrons = 0It has been reported that the hydrogen element has atoms with mass number 2 and 3 also i.e., Atoms of elements having the same atomic number with different mass numbers are called isotopes..

Cl - 35.5 Cu = 63.5 The fractional atomic masses of elements are due to the existence of isotopes having different masse..

The optical microscopes developed in physics are extensively used in the study of biological samples. Electron microscope, X-rays and radio isotopes are used widely in medical scienc..

a) Metal casting can be tested for cracks by putting them in baths of radioactive salts. The castings are then inspected for radioactivity to find out any penetration of salts into cracks. Absence of salt penetration indicates absence of cracks. b) Radioactive isotopes can be used to det..

The principle behind PET scanning is as follows. Short - lived radio isotopes such as 11 C, 13 N or 15 O are produced and incorporated into a solution (of glucose) that can be injected into the bod..

Hydrogen gas in its natural state has 3 isotopes of atomic mass 1, 2 and 3 respectively. Thus average mass works out to be 1.008 a.m.u rather than 1 a.m.u. This in turn complicates the atomic masses of all other element..