Take a look in ~ the photo below. Each of those colored balls is an electron. In an atom, the electrons spin approximately the center, also called the nucleus. The electrons choose to it is in in separate shells/orbitals. Covering number one have the right to only organize 2 electrons, covering two can hold 8, and also for the very first eighteen facets shell three have the right to hold a maximum of eight electrons. Together you learn about elements with much more than eighteen electrons you will find that shell three have the right to hold much more than eight. Once one covering is full, the next electron that is added has to move to the following shell.So... Because that the facet of SODIUM, you already know that the atomic number tells you the number of electrons. That way there space 11 electrons in a salt atom. Looking in ~ the picture, you deserve to see there room two electron in covering one, eight in covering two, and only one in covering three.


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► more about the background and areas to find sodium.► Next element of the periodic table.
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Sodium ChlorideThis is sodium chloride, additionally known as table salt. Most world scientist recognize that the formula because that salt is NaCl. One salt (Na) atom offers it"s electron to one chlorine (Cl) atom. Chlorine then has actually the eight electron in its outer shell to make it "happy". Sodium is "happy" since it has actually now given up that is one extra electron.
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Sodium OxideSo now you have actually Na2O. When sodium (Na) atoms bond with one oxygen (O) atom, there have to be two sodium atoms, each v an extra electron. Every of these sodium atoms provides oxygen one electron, enabling oxygen to have a complete shell through eight electrons. See just how the electrons are shared?
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