Give examples of one element from the alkali metals group and one from the halogens group. Include each element's atomic number, atomic mass, number of neutrons, number of valence electrons, number of electron shells, and some common characteristics of elements from its group.

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

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.

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.