Question 8 of 48beginner🔧 ApplyShort Answer2 marks
Using the Periodic Table, predict the formulas of compounds which might be formed by the following pairs of elements; (a) silicon and bromine (b) aluminium and sulphur.
(a)
Answer
SiBr
(b)
Answer
AlS
Explanation
The formulas are predicted based on the valencies of the elements derived from their group numbers in the Periodic Table. Silicon (Group 14) has a valence of 4 and Bromine (Group 17) has a valence of 1, forming SiBr4. Aluminium (Group 13) has a valence of 3 and Sulphur (Group 16) has a valence of 2, forming Al2S3.