Iron-59 has half-life of 45.1 days. how old is an iron nail if the fr-59 content is 25% that of a new sample of iron

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

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.

Give the orbital configuration of the phosphorus (p) atom.