What is the mass of an atom with 15 protons, 13 neutrons, and 14 electrons?

Silicon (Si)

Explanation:

Add the protons and neutrons mass to get the nucleus mass. Then you get number 14 and 28. looking at the periodic table we can see this matches silicon's atom mass and electron number

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explanation:

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.