Hydrogen has one electron, helium has two electrons, and lithium has 3 electrons. Hydrogen and lithium are both reactive but helium is no reactive. How can electrons be used to explain this pattern of behavior?

Yes you are correct use the scientific method

Talc (french chalk) is the ingredient

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o