Скачать или смотреть Alkaline earth | Wikipedia audio article

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Alkalin...


00:01:04 1 Characteristics
00:01:14 1.1 Chemical
00:03:41 1.1.1 Compounds and reactions
00:04:18 1.1.2 Carbonyl complexes
00:05:01 1.2 Physical and atomic
00:05:19 1.2.1 Nuclear stability
00:06:36 2 History
00:06:45 2.1 Etymology
00:08:03 2.2 Discovery
00:09:24 2.2.1 Beryllium
00:10:25 2.2.2 Magnesium
00:10:56 2.2.3 Calcium
00:11:54 2.2.4 Strontium
00:12:39 2.2.5 Barium
00:13:37 2.2.6 Radium
00:14:26 3 Occurrence
00:16:01 4 Production
00:17:43 5 Applications
00:20:32 6 Representative reactions of alkaline earth metals
00:23:43 7 Identification of alkaline earth cations
00:25:21 8 Compounds of alkaline earth metals
00:28:15 9 Biological role and precautions
00:29:45 10 Extensions



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SUMMARY
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The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.Structurally, they have in common an outer s- electron shell which is full;
that is, this orbital contains its full complement of two electrons, which these elements readily lose to form cations with charge +2, and an oxidation state of +2.All the discovered alkaline earth metals occur in nature, although radium occurs only through the decay chain of uranium and thorium and not as a primordial element. Experiments have been conducted to attempt the synthesis of element 120, the next potential member of the group, but they have all met with failure.