3 similarities and differences between john mallon waterman and chris mccandless

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.