Which of the following groups contain three elements with stable electron configurations?
a. lithium, krypton, argon
c. xenon, neon, boron
b. argon, neon, barium
d helium, xenon, neon
lo

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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.

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)