Modern Periodic Table 0.0 / 5 ? ChemistryOrganic and Green ChemistryThe Periodic TableGCSEAQA Created by: SimanaCreated on: 28-10-15 11:24 When the Periodic Table was first released, why did Scientists think it was not important? There wasn't much evidence to suggest that the elements fit together in that way. 1 of 15 What was a convincing evidence in favour of the Periodic Table? Newly discovered elements fitted into the gaps of Mendeleev's work 2 of 15 What was the Peiodic Table useful for? Predicting properties of elements and summarised the structure of atoms 3 of 15 What was discovered in the 19th century ? P, N, E and the Periodic Table matches up well to what's been discovered about the structure of the atom 4 of 15 When E, P, N were discovered, how was the Periodic Table arranged? In order of atomic number, arranged by their electronic structure. 5 of 15 What does the electron arrangement allow you to do? Predict element's chemical properties 6 of 15 How where E in an atom set out? Shells 7 of 15 What did shells correspond to? Energy level 8 of 15 What do the elements in the same group have? Same no. of E in their highest occupied energy level (outer shell) 9 of 15 What is the group no. equal to? The no. of E in the highest occupied shell 10 of 15 How are E held into place? The positive charge of the nucleus attracts the negative charge of E. 11 of 15 What decreases the attraction of the nucleus? If E is far away from the Nucleus. If there are lot of inner E. 12 of 15 What is the effect known as shielding? When Inner E 'get in the way' of the nucleus charge reducing the attraction 13 of 15 How is an E in a higher energy level more easily lost? Because of the increased distance and shielding, there's less attraction from the nucleus holding it into place. 14 of 15 How is a higher energy level less likely to gain an E? Increased distance and shielding , means there is less attraction from the Nucleus pulling E into the atom 15 of 15
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