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The α -particle scattering experiment of Rutherford concluded that:
(1) The nucleus is made up of protons and neutrons
(2) The number of electrons is exactly equal to number of protons in atom
(3) The positive charge of the atom is concentrated in a very small space
(4)Electrons occupy discrete energy levels
Ans: The positive charge of the atom is concentrated in a very small space
A sub-shell l= 2 can take how many electrons: (1) 3 (2) 10 (3) 5 (4) 6 Ans: 10
law of crystallography
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An aqueous solution has a hydroxyl concentration of 1.75 x 10^-7mol/L. Find the concentration of hydrogen ions in this solution.
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Q. Rehydration tests for the dried sample? • gain knowledge about the sensory changes that take place during the dehydration of the samples, and • learn about the effectiv
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