Question

predict the formula of the binary compound that would be formed by the combination of the following pair of elements Mg and N​

Answer 1

Answer: (i) Alkali metal lithium (with 1 valence electron) combine with group 16 element oxygen (having valence of 2) to  form Li  

2

​  

O.

(ii) Alkaline earth metal magnesium (with 2 valence electrons) combines with group 5 element nitrogen (having valence 3) to form Mg  

3

​  

N  

2

​  

.

(iii) Group 13 element aluminum (with 3 valence electrons) combines with group 17 element iodine (a halogen with valence 1) to form AlI  

3

​  

.

(iv) Group 14 element silicon (with a valence of 4) combines with group 16 element oxygen ( having valence 2) to form SiO  

2

​  

.

(v) Group 15 element phosphorous (with valence 3 or 5) combines with group 17 element fluorine (a halogen with valence 1) to form PF  

3

​  

 or PF  

5

​  

.

(vi)  Element 71 with 3 electrons in the valence shell (4f  

14

5d  

1

6s  

2

) combines with group 17 element fluorine (a halogen with valence 1) to form EF  

3

​  

 where E is the symbol of the element

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Answer 2

To write the formula of a binary molecular compound, first use the prefixes in the name to tell you the subscript of each element in the formula. Then, write the correct symbols for the two elements with the appropriate subscripts.