SAS 03 - CHEMISTRY Flashcards
Tabular arrangement of the elements in order of increasing atomic number such that elements having similar chemical properties are positioned in vertical column
Periodic Table
states that when elements are arranged in order of increasing atomic number elements with similar chemical properties occur at period interval
Periodic law
proposed a system of chemical symbols based on the first letter of their name and based on their ltin name
Jons Jakob Berzelius
arranged elements into groups simple substances that do not decompose by any means
Antoine Lavoiser
Made a list of element arranged in increasing atomic weight in spiral order
A.E Baguyer de chancourtois
Classified elements into group of 3 which he called triads
Johann dobenier
These elements in triads had similar chemical properties and orderly physical properties
Johann Dobenier
arranged the elements according to its atomic weight mass
Lothar Meyer & Dmitri Mendeleev
horizontal row of elements in the periodic table
Period
vertical column of elements in the periodic table
Group
General name for any element in the GROUP IA of the periodic table
Alkali Metals
Soft,shny,metals but they are only moderately reactive to water
Alkaline earth metal
are soft shiny metals that readily react with water
Alkali Metals
Group VIIA
-reactive gasses at room temperature
Halogens
Group VIII A
-unreactive gasses that undergo few,if any, chemical reaction
Noble Gas
element that has characteristics properties of luster, thermal conductivity, electrical conductivity and malleability
metal
element characterized by the absence of the properties of luster, thermal conductivity and malleability
Non Metal
Metallic apperance,but hey are brittle and only fair conductors of electricity
Metalloids
are the tendencies of certain elemental characteristics to increase or decrease as one progresses among a row or column of the periodic table of elements
The periodic trends
chemical element is a measure of the size of its atoms usually mean or typical distance fom the nucleus to the boundary of the surrounding cloud of electrons
Atomic radius
defined as the change in energy of a neutral atom when an Electron is added to the atom to form a negative ion
Electron Affinity