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Cards in this deck (21)
- 1Daltons Atomic TheoryAll matter is made up of very small particles called atoms.
All atoms are indivisible. they cannot be broken down in to simpler particles. - 2Cathode RaysAre streams of negativity charged particles called electrons. they travel in straight lines from the cathode to the anode, are deflected by electric and magnetic fields, and have sufficient energy to move a small object such as a paddle wheel.
- 3Energy LevelDefined as the fixed energy value that an electron in an atom may have.
- 4Ground statethe ground state of an atom is one in which it occupies the lowest available energy level.
- 5Excited stateExcited stater of an atom is one in which electrons occupy higher energy levels than those available in the ground state. unstable and temporary
- 6Heisenbergs Uncertainty PrincipleThat it is impossible to measure at the same time both the velocity and the position of an electron.
- 7An orbitalIs a region in space within which there is a high portability of finding an electron.
- 8A sublevelis a subdivision of a main energy level and consists of one or more orbitals of the same energy level.
- 9An elementis a substance that cannot be split into simpler substances by chemical means.
Robert Boyle - 10A triadis a group of three elements with simpler chemical properties in which the relative atomic mass oft he middle element is approx equal to the average of the other two.
Dobereiner - 11Newlands octavesare arrangements of elements in which the first and the eighth element counting from a particular element have similar properties.
John newland - 12Mendeleevs periodic lawwhen elements are arranged in order of increasing atomic relative atomic mass the properties of the elements recur periodically i.i the properties displayed by an element are repeated at regular intervals in other elements.
Dmittri mendeleev - 13Atomic numberthe number of protons in the nucleus of that atom.
Henry Moseley - 14The modern Periodic lawwhen elements are arranged in order of increasing atomic number the properties of the elements recur periodically i.e the properties displayed t an element are repeated st regular intervals
- 15Mass numberthe sum of the number of protons and neutrons in the nucleus of an atom of that element.
- 16isotopesatoms of the same element which have different mass number due to the different number of neutrons in the nucleus.
- 17Relative atomic massthe average of the mass numbers of the isotopes of the element.
as they occur naturally.
taking their abundances into account and
expressed on a scale in which the atoms of the carbon-12 isotope have a mass of exactly 12 units. - 18Principle of mass spectrometryis that charged particles moving in a magnetic field are deflected to different extents according to their masses and are thus separated according to these masses.
Vaporisation, Ionisation, Acceleration, Separation in a magnetic field, Detection - 19Aufbau Principlewhen building up the electron configuration of an atom in its ground state the electrons occupy the lowest available energy levels
- 20Hunds rule of maximum multiplicitywhen two or more orbitals of equal energy are available the electrons occupy them singly before filling them in pairs
- 21Pauli exclusion
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- Flashcards on Untitled, created by Holly Gillespie on 17/01/2019.
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