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The number of protons determines an element's atomic number (Z) and distinguishes one element from another. For example, carbon's atomic number (Z) is 6 because it has 6 protons. The number of neutrons can vary to produce isotopes, which are atoms of the same element that have different numbers of neutrons.
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atom 2 and 3 or d is should be your answer
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I'm not 100% sure but I think it is b I'm not great with math tho
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spectroscope, optical device used in spectral analysis for producing and measuring their wavelengths and intensities (see spectrum). When a material is heated to fire, it emits light, typical of the atomic composition of the material.
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