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The alkaline earth metals (Be, Mg, Ca, Sr, Ba, and Ra) are the second most reactive metals in the periodic table, and, like the Group 1 metals, have increasing reactivity with increasing numbers of energy levels. Beryllium (Be) is the only alkaline earth metal that does not react with water or steam, even if the metal is heated red hot. [9]
A currency detector or currency validator is a device that determines whether notes or coins are genuine or counterfeit.These devices are used in a wide range of automated machines, such as retail kiosks, supermarket self checkout machines, arcade gaming machines, payphones, launderette washing machines, car park ticket machines, automatic fare collection machines, public transport ticket ...
Critics claim that professional counterfeiters use starch-free paper, making the pen unable to detect the majority of counterfeit money in circulation. [4] Magician and skeptic James Randi has written about the ineffectiveness of counterfeit pens on numerous occasions [ 5 ] [ 6 ] and uses a pen as an example during his lectures. [ 7 ]
Gold has been one of the best-performing assets this year.The price of the yellow metal has soared 27% year to date to about $2,600 an ounce. Prices hit a fresh record high of $2,694 an ounce on ...
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