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The facet with atomic number 3 is lithium (Li), atomic mass 6.941. The most abundant lithium isotope is

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having 4 neutron in that is nucleus. A few percent the helium atoms are the
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isotope, which has actually only 3 neutrons. The third electron in lithium cannot fit in the lowest power shell, which, as listed above, is full with only 2 electrons. Therefore, the 3rd electron in lithium goes right into a second shell, that is, one outer shell.

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As a repercussion of its electronic structure, lithium is the shortest atomic number facet that is a metal. In a basic sense, steels are elements that normally have only 1–3 electrons in their outer shells. This electrons have the right to be shed from steels to develop positively fee cations with charges of +1, +2, or +3. In the pure elemental state metals frequently have a characteristics luster (shine), they are malleable (can be planarization or pushed into various forms without breaking) and also they conduct electricity. Although some metals, significantly lead and mercury, are an extremely dense, lithium is the least thick metal at only 0.531 g/cm3.

Two that lithium’s 3 electrons are inner electron contained in one inner shell as in the immediately preceding noble gas helium. Inner shell electrons such together these continue to be on average reasonably close come the nucleus, are really tightly held, and also are not exchanged or common in altoalsimce.orgistry bonds. As mentioned above, the 3rd electron in lithium is one outer electron farther from, and also less strong attracted to, the nucleus. The external electron is said to it is in in the atom’s outer shell. These concepts are illustrated in number 3.4.

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Figure 3.4. An atom that lithium, Li, has 2 inside electrons and also 1 external electron. The latter can be shed to one more atom to create the (ceLi^+) ion, i m sorry is present in ionic link (see ar 2.12).

The Lewis symbol because that atoms such together lithium that have both within shell and outer covering electrons normally shows just the latter. (Inner covering electrons deserve to be displayed on symbols to highlight a point, yet normally this takes too much space and can be confusing.) due to the fact that lithium has only one external shell electron, that Lewis prize is

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Consider the the lithium atom has actually an inner shell of 2 electrons, just like helium. Being only 1 electron away from the helium noble gas structure, lithium has a tendency to shed its extra electron for this reason it have the right to be favor helium as shown by the following: