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. An element X has mass number 35 and the number of neutrons in its atom is 18.(a) To which group of the periodic table element X belongs?(b) To which period of the periodic table element X belongs?(c) What will be the formula of chloride of element X? |
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Answer» Mass number of element is 35Number of neutrons= 18 Formula to find number of protons: Mass number = number of protons + number of neutrons.35=× +18×=35 - 18X=17.Number of protons =17 and number of electrons also will be 17 as atom is electrically neutral. Hence Element is chlorine Electronic configuraton:1s2 2s2 2p6 3s2 3p5 Group number= 17Period number =3Valency =1 thank you. |
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