If an element has 12 protons, 13 neutrons, and 15 electrons, what is its mass?

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong

Which statement best describes what happens when molecular compounds melt

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