The atomic number (Z) of an element represents the number of protons in the nucleus of an atom. Since element T has an atomic number of 6, it means there are 6 protons in its nucleus.
The mass number (A) of an atom represents the sum of protons and neutrons. In this case, the mass number of element T is 13. However, since we already know there are 6 protons, we can subtract the atomic number from the mass number to find the number of neutrons.
Number of neutrons = Mass number - Atomic number = 13 - 6 = 7
So, element T has 6 protons, 6 electrons (since atoms are electrically neutral and the number of electrons equals the number of protons in an atom), and 7 neutrons.