Tritium (Hydrogen-3) is a radioactive nuclide with a half-life of 4500 days. It decays to an isotope of helium. Determine the time required fro 90% of the sample of tritium to decay.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided