Concept:An electrovalent bond forms when electrons are transferred from a metal with few valence electrons to a nonmetal that needs electrons.
Explanation:Write the electron configuration of each element from its number of electrons.
P:6=2,4Q:11=2,8,1R:15=2,8,5S:17=2,8,7Q has 1 valence electron and readily loses it to become stable.
S has 7 valence electrons and needs 1 electron to complete an octet.
So
Q transfers its 1 valence electron to
S, forming an electrovalent bond.
Options A, B, and C incorrectly describe bonds between two nonmetals, which are usually covalent.
Therefore, the correct bond is between
Q and
S.
Answer:Option D:
Q will form an electrovalent bond with
S.