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
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Guys if u r lookin @ d configuration...u'll make mistake. I tink d best option is to recognise d metal n non metalic element. N of course u knw dat electrovalent bond is the transfer of electron 4rm metal 2 non metals. N also remember dat all chemical bondin is to attain a stable duplet or octet structure.... Remember jamb cunny o

Electrovalent bonds involves the complete transfer of electrons in the outermost shell of a metal to a non metal while Covalent bond involves the sharing of pairs of electron equally donated by both elements.

The oxidation nmbr of Q is +1(metal) and that of S is -1(non- metal) thus, d bond dat exists btwn a metal and a non- metal is electrovalent, hence, the answer iz D and the compund produced is crystalline in nature, sodium chloride, NaCl, QS.

electrovalent bond is d transfer of electrons, so Q wil form an electrovalent bond wit S in order 2 complete an octet structure, giving u NACl

Just to add to it...
Electrovalent bond is formed when an elctron is transferred from a metallic atom to a non metalic atom while covalent bond involves the share of electron(s) btw two non metals.

D. Is the correct answer. But experience tells us that the compound QS formed cannot be purely electrovalency. There must be some covalency present. Hence electrovalent compounds form aggregates rather than molecules.

P = 2,4
q = 2,8,1
r = 2,8,5
s = 2,8,7
therefore, Q which is equal to 2,8,(1) => S 2,8,(7) to complete its octect.





