An 18O atom contains the same number of protons, neutrons, and electrons. 17) Using grammatically correct English sentences, describe what the isotopes of elements have in common. 2) The atom with the extra electron now has a negative charge (because there are more electrons than protons) and is called a negative ion. And since opposites attract, the ions get it together to form molecules.
a) Element Symbol – one or two letter abbreviation to signify the full name of the element b) Charge – the difference between electrons and protons (+ has more protons, - has more electrons, 0 has both electrons and protons) c) Atomic Number – Identifies the number of protons d) Mass Number – Identifies the number of protons and neutrons 9.