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17 October, 19:21

What is the difference between the number of electrons in an atom of selenium, se, and the number of electrons in an atom of aluminum, al

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  1. 17 October, 23:18
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    Selenium has 36 electrons34 (atomic number) + 2 (amount of electrons gained in the ion, has a 2 - charge) = 36

    To identify the number of electrons an element has, all you need is a periodic table. Identify the atomic number (the smallest of the 2 numbers in the box). That number will be the number of protons which is also the number of electrons.

    *number 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) 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.
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