i need ti know how many electrons aluminum have
how many electrons does aluminum have?
If you look at the periodic table, Al's atomic number is 13, so it must have 13 protons(+1) and, resultantly, 13 electrons (-1) to balance out the charge.
To identify the number of electrons an element has, all you need is a periodic table. Identify the atomic nymber (the smallest of the 2 numbers in the box). That number will be the number of protons which is also the number of electrons.
Erin D. is correct--but why? Make sure you learn the "why" behind this so you can answer other similar questions.
Atoms of all elements are made up of three primary particles: protons, neutrons, and electrons. The "sub-atomic" particles each have specific properties that such as size, electrical charge, etc. that are crucial for the stability of the atom. The particles break down like this:
Particle Relative size Charge Location How to determine
Proton 1 + in the nucleus # of protons= element's atomic # (use periodic table)
Electron 0 - outside nucleus # of electrons=# of protons(in neutral, "normal" atom)
Neutron 1 0 in the nucleus Must be told or given (ie. can vary--isotopes--
for small elements most common form often
consists of isotope where #protons=#neutrons)
So Aluminum has 13 electrons because it needs 13 negative charges to balance the 13 postively-charged protons (which is what the periodic table told us it contains). This will make the Aluminum atom electrically neutral.
What if I had Nitrogen (N) or Uranium (U) atoms?
Well, these atoms would have 7 and 92 electrons respectively. Why? See if you can use the above material and figure out the "why" and you will be set for any similar questions.
Also your teacher may ask you how many electrons are in Al^+3, the ionic form of aluminum, the +3 means your aluminum atom has a positive charge of 3 which means it has three less electrons than a nonionic atom of aluminum.
so your answer will be 10 electrons in that case.