How much time must elapse before 16 grams of potassium-42 decays, leaving 2 grams of the original isotope? *

I really don’t get it please answer quick

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Why doesn't heat added to water make the tempature rise above 100c

The grooves or folds of the brain are called