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how many electrons does aluminum have?

i need ti know how many electrons aluminum have

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Aluminum has 13 electrons in a neutral atom. The 1S2, 2S2 and 2P6 shells are full, and so is the 3S2. The 3P1 shell has one electron in it (in Al's neutral atom) and that gives aluminum one lone valence electron and two "semi-valence" electrons which can be loaned out. And what'll you bet that it would like to loan that electron out? Or the other two? You're right, it would like to do that. It's oxidation states are +1, +2 and +3.
It has 13 electrons and 13 protons because it is the 13rd element of the periodic table.

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4 Answers

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.

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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.