Question

for each of the pairs of elements below give the formula for the simplest compound to be formed from them and explain the basis of your decision and note if the bond(s) formed are ionic or covalent.

a) silicon and oxygen (SiO2)


b) chlorine and bromine (BrCl)

Thanks!

Answer 1

Your formulas are right.
In general, ionic bonds are formed when elements from the sides of the periodic table (left side and right side) combine. Examples are LiCl, BaCl2, AlCl3 etc.
In general, covalent bonds are formed when elements from the center combine with left or right side elements (examples are CH4, CCl4, SiCl4) OR when elements from the same side combine with each other (examples are Cl2, Br2, I2, F2, O2, N2, ClF, ).