1. Atoms are mostly empty space
2. Atoms have a concentration of positive matter somewhere in them
3. The concentration of this positive matter is very small
The best example I
can give that is observable but does not contain matter is:
sunlight or simply light
Light does not contain matter because it is a beam of energy
or to be specific made up of packet of photons.
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Na (sodium) and Rb (rubidium) have the most similar chemical properties. They're both Alkali metals, found in the first column of the periodic table.
Answer:
species originate through allopatric speciation:
Have a good day! :)
