Which is the only element in group 1 on the periodic table that forms covalent bonds?

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?