JAMB - Chemistry (1978 - No. 6)
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
P will form an electrovalent bond with R
Q will form a covalent bond with S
R will form an electrovalent bond with S
Q will form an electrovalent bond with S
Q will form a covalent bond with R
Explanation
Element P with 6 electrons has an atomic number of 6 = 2, 4 → C
Element Q with 11 electrons has an atomic number of 11 = 2, 8, 1 → Na
Element R with 15 electrons has an atomic number of 15 = 2, 8, 5 → P
Element S with 17 electrons has an atomic number of 17 = 2, 8, 7 → Cl
Given the above is the electronic arrangement of P,Q,R,S elements, Q will form an electrovalent bond with S because element Q(metal) has a valence of electron of 1 it can donate to another element needing 1 electron, which is element S (a non-metal). Thus, electrovalent bond is formed in compounds where there is a transfer of electron from metals to non-metals.
Element Q with 11 electrons has an atomic number of 11 = 2, 8, 1 → Na
Element R with 15 electrons has an atomic number of 15 = 2, 8, 5 → P
Element S with 17 electrons has an atomic number of 17 = 2, 8, 7 → Cl
Given the above is the electronic arrangement of P,Q,R,S elements, Q will form an electrovalent bond with S because element Q(metal) has a valence of electron of 1 it can donate to another element needing 1 electron, which is element S (a non-metal). Thus, electrovalent bond is formed in compounds where there is a transfer of electron from metals to non-metals.
Comments (0)
