Write the noble-gas notation for a gold atom.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Is laundry detergent an acid or a base?

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.