If a lithium has 3 protons, 3 neutrons, and 3 elestrons, an isotope of this atom would have how many protons, neutrons, and electrons

An isotope of this atom would still have 3 protons and 3 electrons. It is the number of neutrons that changes. For that u would have to have the mass number of the atom since p + n = ma, therefore ma - 3 = n

The atomic number would always be 3,or the element would change entirely.You could deduce the number of neutrons to 2 making it lithium-5.
Lithium-5 has 3 protons,2 neutrons,and 3 electrons.

The masses of the objects and their densities

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.