What is the best explanation of why it was important that becquerel used a uranium salt in his experiments?

uranium salts are solid at room temperature.
uranium atoms are found in photographic plates.
uranium atoms are radioisotopes.
uranium salts are very common.

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers

Which diagram represents the phase tha occurs after a solid melts?

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.