Flashcards
Edexcel Chemistry Topic 1
Flashcards do conjunto (9)
- 1Structure of an atomA proton and a neutron in the nucleus
An electron orbiting the nucleus - 2Relative masses and charges of a proton, a neutron and an electronProton: + charge, 1 relative mass
Neutron: no charge, 1 relative mass
Electron: - charge, 0.0005 relative mass - 3Definition of atomic number and mass numberAtomic number: proton number
Mass number: total number of protons and neutrons - 4An IsotopeIsotopes are elements with the same number of protons but a different number of neutrons (hence different mass number as well)
- 5Relative isotopic massAtomic mass is based on the mass of carbon12, which is 12 AMU
- 6First ionisation energyThe energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions
- 7Successive ionisation energiesThe energy needed to remove a second electron from one mole of the 1+ ion, to give a 2+ ion. This can be repeated for all the remaining electrons
- 8Evidence for electronic configuration1. Atomic emissions spectra provides evidence for quantum shells
2. Successive ionisation provides evidence for quantum shells and the group to which the element belongs
3.The first ionisation energy of successive elements provides evidence for electron sub-shells - 9An orbitalAn orbital is a region within an atom that can hold up to two electrons with opposite spins
Informações
- Descrição
- Atomic Structure and The Periodic Table
- Criado por
- Sofiya Pizyur
- Visualizações
- 9
- Avaliação