properties of the elements. Studying the atoms, we know that the oxygen presents an electronegativity that brings the hydrogen atoms forming a polar molecule. 1 What parts of Dalton’s atomic theory no longer agree with the current picture of the current picture of the atom? Provide an answer using at least 3 to 4 complete content related sentences in your own words. In the image of the atom that exists today Dalton's atomic theory does not comply with the discoveries that have been developed. Dalton said in his theory that an atom is a small particle and cannot be divided, but as we see in the image the atoms can be divided into smaller particles such as protons, neutrons and electrons. In the theory of Dalton says that the atoms cannot be destroyed, but today we know that these atoms can be destroyed. Delton says that the atoms that are in the same elements are the same, but now it has been shown that the theory is wrong since there are isotopes. 1.If an element has 12 protons and 17 neutrons, how many electrons must it have? 2.Why are the atomic masses of elements usually decimal numbers? Provide an answer using 3 – 4 sentences in your own words.
3. In 3 – 4 sentences and in your own words describe how Mendeleev’s periodic table differs from Moseley’s. The difference in the periodic table between Mendeleev and Mosley is that in Mendeleev's table the elements are ordered by their atomic masses. Mendeleev organized his table in a grid pattern, building it on the basis of a more modern periodic table. Mendeleev table the periods are listed vertically as well as the groups are listed horizontally.