If a substance has a half-life of one year, how long will it take for half of the substance to decay?

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.

answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;