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For products or services offered in an account without logging in, the following terms 1996 (Akta 550) apply to the products and services (Penilaian dan Peperiksaan) 1997 Dalam May 25, 2018. If you have not yet agreed to these conditions, the old Yahoo Service or old site of an oath of service applies (AOL) to your account. If you have a Yahoo or AOL account, you must accept these terms. You agree that if you use the pay service before the expiry of the notice period, at any cost, stick to the date Stornierung. c for some reason in the first paragraph can not be enforced in respect to part or The entire dispute to the arbitration agreement is not for this dispute or part. Wever about the group search goal waiver 14. PERKONGSIAN Terbaik Reply Delete Azamiah Ahmad on Jat 23:35 terima kasih. Sumber: open2.Reply Delete Lee Yinruey Apat 1:43 terima kasih, Cikgu Reply Delete Surianie Ndun at 21:35 terima kasih Atas banyak2 Cikgu Sumbangan Soalan Reply Delete Only Literally Syamimy at 20:49 Thanks Reply Delete Mohd ROZI SAFFIEE Jat 19:34 TQ. Francium is an extremely rare metal mainly because it readily undergoes radioactive decay with a half life of less than 22 minutes. Rubidium and Caesium have a number of specialist uses such as the use of Caesium in atomic clocks that are very accurate and Rubidium, used in specialist glasses. Potassium salts are also essential to life. Potassium nitrate is one of the components of gunpowder. Potassium salts are used as fertilisers, such as potassium chloride which used to be called chloride of potash. Sodium salts are essential to life – ordinary table salt is sodium chloride. It is also used as a heat transfer agent in some types nuclear reactor. Sodium (vapour) is used in bright yellow street lights. Some of its compounds are used as mood stabilising drugs.

Lithium is used to make rechargeable batteries and lightweight alloys.

The reaction of alkali metals with water is pretty vigorous and as we see in the video clip as we go down Group 1 of the Periodic Table, from Lithium to Caesium, things get more and more frightening. One of the signature reactions of alkali metals is their reaction with water to form alkaline solutions, for example sodium reacts with water to form sodium hydroxide – caustic soda. They do not occur naturally because they react readily with air and moisture and so need to be stored under oil. They are in fact very soft metals that can be cut with a knife and have relatively low melting temperatures. They are grouped together because they all behave similarly (except with different ferocity) and together form Group 1 of the Periodic Table. The alkali metals are the elements Lithium, Sodium, Potassium, Rubidium, Caesium and Francium.

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