2 and 3, because there are the protons and neutrons which have a greater mass than the electrons which are found in the locations 1 and 4.
Explanation:
The atom contains a nucleus, which is made from protons and neutrons, and electrons which are found around the nucleus.
The mass of the atoms is concentrated in the very tiny space represented by the nucleus. Of course the electrons have a mass too, but is very small compared to the protons and neutrons, and we usually neglect its mass.
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subatomic particles
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The number of outer electrons determines the chemical properties of an element, which is a correct statement. Because the number of valence electrons determines the bonding.
Answer: True
Answer is D absorption line at 502
