What element is a byproduct of nuclear fusion?

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

Describe the interaction that occurs between two objects with the same electrical charge.

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars