Take a look at the snapshot below. Every of those fancy balls is an electron. In an atom, the electron spin approximately the center, likewise called the nucleus. The electrons choose to it is in in separate shells/orbitals. Shell number one can only host 2 electrons, covering two deserve to hold 8, and for the an initial eighteen elements shell three have the right to hold a preferably of eight electrons. Together you learn about elements with an ext than eighteen electrons you will uncover that shell three deserve to hold more than eight. Once one covering is full, the following electron that is added has to relocate to the following shell.So... Because that the facet of SODIUM, you currently know that the atomic number speak you the variety of electrons. That means there space 11 electron in a salt atom. Looking at the picture, you deserve to see there are two electrons in shell one, eight in covering two, and only one in covering three.


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► much more about the background and places to find sodium.► Next element of the regular table.
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Sodium ChlorideThis is sodium chloride, likewise known together table salt. Most human being scientist understand that the formula for salt is NaCl. One salt (Na) atom provides it"s electron to one chlorine (Cl) atom. Chlorine then has the eight electrons in its external shell to make it "happy". Salt is "happy" because it has actually now offered up the one extra electron.
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Sodium OxideSo currently you have Na2O. When sodium (Na) atom bond v one oxygen (O) atom, there have to be two sodium atoms, each through an extra electron. Each of these salt atoms provides oxygen one electron, permitting oxygen to have actually a full shell through eight electrons. See exactly how the electrons room shared?
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