The half-life of the isotope uranium-238 is 4 468 000 000 years.
Uranium has a half life of 5,600 years. After that period, one half of the uranium becomes lead. That is why lead is found in uranium deposits.
Arizona
Uranium-238 emits alpha radiation; its half-life is 4,468×109 year.
Well, I couldn't get any stable element with mass number of 77. However the closest ones are arsenic with mass number 75 or selenium with mass number 79. Note: All the following elements listed below have isotopes with mass number 77, but are unstable with half life ranging from a few hours to nano seconds: Nickel, Copper, Zinc, Galium, Germanium, Arsenic, Selenium, Bromine, Krypton, Rubidium, Strontium and Yttrium. If you had meant atomic number, then iridium has the atomic number of 77.
For a rock to have started with 1500 atoms of any element and now have 750 it has undergone radioactive decay equal to one full half life (i.e. there are half the number of atoms now than at the beginning).Uranium-235 has a half life of 7.038×108 years.As such, the rock is 7.038×108 or 703 million years old.
8.127 rounded to the nearest half is 8.
500,000
4.5
There is no isotope of Uranium 206 - Uranium 217 is the lightest.
Half a million is 500,000
5,500,000
0.015
Uranium is a radioactive element and conteneously disintegrate into smaller element, that time in which 1g of uranium becomes half g is known as half life period of uranium.
The standard form is 4.5 × 100The standard notation is 4.5
Uranium has a half life of 5,600 years. After that period, one half of the uranium becomes lead. That is why lead is found in uranium deposits.
703, 800,000
Each isotope of uranium has its half life. See the link below.