Each element<span> can usually be classified as a metal or a non-metal based on their ... They are usually </span>dull<span>and therefore show no metallic </span>luster<span> and they do not reflect ... </span>Dull<span>, Brittle solids; Little or no metallic </span>luster<span>; </span>High<span> ionization energies; </span>High<span> ...</span>
Answer:The 2nd and 3rd one.
Explanation:
It has the same number of protons but different amount of nuetrons.
Answer:
True
Explanation: Imagine the Electrons is by the nucleus which give more energy.
