When an alpha particle is released by an atom, the atom

loses one electron.

has an increased mass number of four.

loses a helium nucleus. = correct answer

gains a neutron.

The clouds are grey and ground is wet. a quantitative b qualitative

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?