The atomic number of an element X is 14,and its relative atomic mass is 28. how many neutrons does an atom of X contain? what is the electronic distribution in an atom of X? will X react in an electro-valent or covalent manner? give reasons for your answer.
Bromine has two naturally occurring isotopes. One of them, bromine -79 has a mass of 78.9183 u and an abundance of 50.69%. What must be the mass and percent natural abundance of the other, bromine-81?
there is 10g of mixture of NaCl and Na Br. if the amount of sodium is 25% of weight of total mixture calculate amount of Nacl and NaBr present in the mixture?
25.3 g of sodium carbonate na2co3 is dissolved in enough water to make 250ml of solution .if na2co3 dissassociates completely molar concof na+and co32- are
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