A 7.50 g sample of potassium 40 was collected after 8.757 x 10^9 years 0.05859 g of the sample remained. what is the half life of potassium 40?

What happens to isotopes that are unstable?

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust