Which pair of elements is most likely to form an ionic bond?

a: hydrogen and helium
b: lithium and potassium
c: potassium and iodine
d: iron and zinc

10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Connect the whole numbers on the periodic table to indicate what they represent?