Question

b) An element P (atomic number 20) reacts with an element Q (atomic number 17) to
form a compound
Answer the following questions giving reason.
i)
Write the position of P and Q in the modern periodic table.
Give the valency of P and Q.
Write the molecular formula of the compound formed when P reacts with Q.(3)​

Answer 1

Answer:

When P reacts with Q, it looses the two valence electrons (valency 2). These two valence electrons are accepted by two Q atoms (valency 1). Hence, the formula of the compound formed between P and Q is PQ2 .