Question

the atomic number of four elements P Q R and S are 6 10 12 and 17 respectively
which two elements can combine to form a covalent compound
a) p and r
b) p and s
c) q and s
d) r and s​

Answer 1

Answer:

P is Carbon

Q is Neon

R is Magnesium

S is Chlorine

so P & S Will form covalent compound.

Answer 2

Let us look at the Answer:

Explanation:

The given four elements have electronic configuration as:

P (6)  ----> 2, 4

Q(10)  --> 2,8

R(12) ---> 2,8,2

S(17)  ----> 2,8, 7

The element Q is noble gas that is it cannot react with any other element as it's outermost shell is completely filled.

Covalent bonding is the bonding of elements by sharing of electrons while Electrovalent/ionic is formed by loss of gain of electrons.

The element P and S can form covalent compound with the formula, PS₄. The element P will share its 4 electrons with four atoms of S.