Answer
a. Carbon : 6 protons and 6 electrons
b. Fluorine: 9 protons and 9 electrons
c. Tin: 50 protons and 50 electrons
d. Nickel: 28 protons and 28 electrons
Work Step by Step
The atomic number (number of protons) is represented by the number above the elements in the periodic table.
The number of electrons is the same as protons, but with opposite charges.
The atomic number of Carbon is 6, which means 6 protons and also 6 electrons.
You can find this answer at pages 114 and 115, topic 4.4 'Atomic Number and Mass Number.'
