How many protons, neutrons, and electrons are in the following atom: (a) 40Ar
Okay guys, so in this question we have to state how many protons, neutrons and electrons are there in the atom.
So our atoms is going to be argon and forty. Okay, so we need the number of protons, we need number of electrons and number of neutrons. Now remember when they give you an atom that looks like this, that number on the upper left represents the mass. So, we use the mass to find the number of neutrons, but before we find the number of neutrons we need the number of protons. Remember, the number of protons means that it's going to be its atomic number. Okay, so that's equals the atomic number. And the atomic number of argon, all you have to do is look at the periodic table and it's going to be eighteen. So, we found our number of protons, now we can find the number of neutrons.
All we do is take our mass and we subtract the number of protons. So we take forty minus eighteen and we're going to get twenty two neutrons. Alright, and finally we need to find the number of electrons. Number of electrons equals the number of protons. Okay, because this is going to be a neutral atom, this is not an ion so that's why we say the number of electrons equals the number of protons. So in this case, number of electrons is going to be eighteen. And remember, electrons are negatively charged and number of protons is positively charged.
Alright, and that's how you figure out all three. See you guys soon.