Question

Chemistry help please? I give medals.

Using the periodic table, choose the more reactive metal.

Cs or Sr

Answer 1

Look at the trends in the periodic table

Electronegativity, is the affinity of an atom to hold onto electrons, an atom like F with a high electronegativity holds onto its electrons much more strongly than Ca

Electronegativity relates to the size of the atom, a larger atom will have more inner shell electrons which will shield the nucleus from the valance electrons making its hold on the valance electrons much weaker

Here is a good table with all the trends

https://upload.wikimedia.org/wikipedia/commons/f/fe/Periodic_trends.svg


Does this help you to answer your question?

Answer 2

Reactivity is related to the ability of a chemical species electrons to interact with other species in its environment.

Answer 3

Sr is the answer