Download Alkali and Alkaline earth metals (Periodic Table of the by Monica Halka PDF

By Monica Halka

Scientists categorize the chemical parts as metals, nonmetals, and metalloids principally in keeping with the weather' talents to behavior electrical energy at basic temperatures and pressures, yet there are different differences taken under consideration whilst classifying the weather within the periodic desk. The alkali metals, for instance, are metals, yet have such specific houses that they're given their very own category. a similar is correct for the alkaline earths.

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Sodium azide (NaN3) is used in air bags in automobiles. Upon impact, an electrical discharge causes the sodium azide to rapidly decompose into sodium metal and nitrogen gas, as shown by the following equation: 2 NaN3 (s) → 2 Na (s) + 3 N2 (g). The nitrogen gas fills the air bag in a matter of about 40 milliseconds. The bag actually begins to deflate again before a passenger’s head or torso strikes the bag. If the bag did not deflate again slightly, the inflated bag would be so hard as to injure the passenger.

If the tests indicate properties unknown in any other element, it is a reasonable conclusion that a new element has been discovered. Sometimes there are hazards associated with isolating a substance whose properties are unknown. The new element could be toxic, or so reactive that it can explode, or extremely radioactive. During the course of history, attempts to isolate new elements or compounds have resulted in more than just a few deaths. How New Elements Are Made Some elements do not occur naturally, but can be synthesized.

During a depressive episode, the tendency is to sleep poorly, undergo extremely low selfesteem, and have difficulty concentrating. A direst possibility during the depressive stage is to attempt suicide. In the 1940s, scientists discovered that lithium carbonate helps to even out a person’s high and low mood swings. By the 1970s, lithium   AlkAli & AlkAliNE EArtH MEtAls was being prescribed quite commonly for patients diagnosed with bipolar disorder. More than 50 years later, scientists are finally beginning to understand how lithium is able to regulate the radical nature of bipolar emotionality.

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