Question

the atomic number of an element 1 point equals: the number of neutrons the mass number the number of protons the number of electrons plus neutrons rutherfords gold foil experiment 1 point demonstrated that: electrons have negative charges atoms are mostly empty space protons exist in the nucleus neutrons have no charge which element would most likely * 1 point form a positive ion? chlorine docs.google.com

Explanation:

1. By definition, the atomic number of an element is equal to the number of protons in its nucleus.
2. In Rutherford's gold - foil experiment, most of the alpha particles passed straight through the gold foil, demonstrating that atoms are mostly empty space.
3. Metals tend to lose electrons to form positive ions. Chlorine is a non - metal and tends to gain electrons to form negative ions. Metals like sodium, potassium etc. would form positive ions. But among the options given, no metal is present, and this question seems to be incomplete. However, based on the concept, non - metals don't form positive ions easily.

Answer:

1. C. The number of protons
2. B. Atoms are mostly empty space
3. (Incomplete question as no valid metal option is given among the presented choices)