The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-100 has been reduced to a mass of 1 mg.
What was the initial mass (in mg) of the sample?
What is the mass 8 weeks after the start?

there's the proffessional site that will you.

multiply it by 5 in order for you to understand i cant give an exact answer.

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question