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Ncert solutions for class 12 chemistry chapter 2 solutions. A solution is a homogeneous mixture of two or more. I can identify the relative size, charge and position of protons, neutrons, and electrons. Ask your doubts in discussion forum and share your knowledge with your friends and other users. How many electrons are present in k, l and m shell of the atom. Atoms, molecules, and ions atomic theory of matter the theory of atoms. He suggested that everything in the world was made up of some combination of four elements.940 536 879 1393 143 1384 865 519 1247 1260 409 839 866 406 1169 894 771 577 45 257 972 895 1269 1162 334 655 461 1246 21 1256 767 82 1449