An atom has 25 protons,20 neutrons, and 19 electrons. which atom is this, what is the atom's mass number?

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n