Atomic number = 15 and mass number = 31 where an atom has 15 protons, 15 electrons and 16 neutrons.
What is an atom?
An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Atomic number = Number of protons.
Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
Hence, atomic number=15 and mass number=31.
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