Question

Which of the following does not have eight valence electrons?

Select one:
a. Rb+1
b. Cl-
c. Ti+4
d. Sr+1
e. Xe

Answer 1

Hint: as we can see from periodic table of elements, we have:
\(\Large Cl^-\) has the same electronic configuration of \(\Large Ar\);
\(\Large Rb^{+1}\) has the same electronic configuration of \(\Large Kr\);
\(\Large Ti^{+4}\) has the same electronic configuration of \(\Large Ar\);
\(\Large Sr^{+1}\) has the same electronic configuration of \( \Large [Kr]5s^1\)
finally:
\(\Large Xe\) is a noble gas
Please keep in mind that \( \Large Kr\) and \( \Large Ar\) are two noble gases