ANSWER
The element is carbon
Symbol of the element is C
The number of proton is 6
The number of neutron is 6
The atomic number is 6
Step-by-step explanation
The number of electrons = 6
The mass number of the element = 12
In a neutral atom, the number of electrons is always equal to the number of proton.
Since the number of electrons is 6, then the number of protons is 6
Recall, that mass number is the summation of number of proton and number of neutron
Mass number = number of proton + number of neutron
12 = 6 + number of neutron
Subtract 6 from both sides
12 - 6 = 6 - 6 + number of neutrons
Number of neutrons = 6
Therefore, the number of neutron is 6
The atomic number of the element is 6
The element is carbon