How do you figure out how many isotopes an element has?

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

What three things determine the shape and size of a puddle when water is poured out onto a surface