https://quizlet.com/17797282/periodicity-review-flash-cards/
i took a test like this and i went to this site /\ /\ /\ and the flash cards have the answers
When a radioactive isotope releases an alpha particle, the atomic number of the atom is decreased by four.
So, the correct answer is B.
Hope this helps,
Davinia.
Its B i believe, Storms and currents can bring in sediments from other places
Answer:
4.5 moles
Explanation:
One mole is equal to 6.022 x 10^23 atoms
2.71 x 10^24 atoms * 1 mol/ 6.022 x 10^23 atoms = 4.5 moles
