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THE HISTORY OF PERIODIC TABLE

The periodic table is invented due to avoid confusion while searching and locate the elements. at that time chemists are started to frame ways to group these elements and compounds on the basis of their physical and chemical states. at the beginning of the 18 th century, a scientist called joseph Louis stated that the hydrogen atom is a building material and atoms of all other elements are simply due to a combination of a number of hydrogen atoms. and also considering some examples the atomic weight of hydrogen is taken as ONE. DOBEREINER'S TRIAD THEORY: dobereiner's he was a German man. he was tried to prove the relationship between elements of their properties and atomic weights. he stated that the arrange the three elements are in ascending order which has similar properties with the help of atomic weights. and the middle element is the average of the first and third elements. this theory is called the law of triads. limitations: this law failed for low mass and very high ma...

GSM GLOBAL SERVICE FOR MOBILE COMMUNICATION

GSM IS NOTHING BUT GLOBAL SYSTEM FOR MOBILE COMMUNICATION. GSM SIM 800A: HIGHLY MODERN GSM.MOST POPULAR AND ADVANCED GSM CONNECTION BETWEEN GSM AND ARDUINO: WHENEVER WE WANT TO CONNECT THE GSM TO ARDUINO IS QUITE SIMPLE WHY BECAUSE WE HAVE TO MADE ONLY THREE CONNECTIONS. THEY ARE:[TX AND RX AND GROUND] GSM IS AN INTERNATION STANDARD; THERE ARE SEVERAL GSM MODULUS SIM900,SIM 800A,SIM 808,GSM 520 etc, also, there are several subcategories in the above modules. NOTE: the sim 800A can send or receive data over GPRS, send or receive SMS, and voice calls. it can communicate with pc or microcontroller. AT commands are the main communication commands to all gsm modules. AT means attention commands. specifications of gsm 800a: it operates on quad-band 850/1900 MHz. weight around 40grams. current must be more than 1 ampere. supply voltage range 5v-20v. it can hold the sim card. two LEDs are used in it, one is for network led and the other is for ring led. the above-mentioned specifications are s...