Hel pl what would be the mass of 4.28 x 10^23 molecules of ammonia (NH3)?

Which statement about the stamps is correct?

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.