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periodic table

chem definitions

TermDefinition
element is a substance that cannot be broken into simpler substances by chemical means
triad a group of 3 elements with similar chemical properties in which the atomic weight of the middle element is the average of the other two, e.g: CL, BR, I
newlands octaves arrangements of elements in which the first and eighth element, counting from a particular element, have similar properties
mendeleev's periodic law when elements are arranged in order of increasing atomic weigth the properties of elements recure periodically, i.e: repeated at regular intervals, in other elements
atomic number (of an atom) is the number of protons in the nucleus of that atom
modern periodic table arrangement of elements in order of increasing atomic number
modern periodic law elements are arranged in order of increasing atomic number, properties of elements recur periodically, i.e: properties displayed repeated at regular intervals in other elements
mass number is the sum of the number of protons and neutrons in the nucleus of that atom
isotopes atoms of the same elements which have different mass numbers due to different numbers of neutrons in the nucleus but the same atomic number
principle of mass spectrometry is that charged particles moving in the magnetic field are deflected to different extents according to their masses & thus separated according to their masses
electronic configuration shows the arrangement of electrons in an atom of an element
Created by: MuireannD
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