CHEM Flashcards
(22 cards)
Tabular arrangement of the elements in order of increasing atomic number such that elements having similar chemical properties are positioned in vertical columns
Periodic table
states that when elements are arranged in order of increasing atomic number, elements with similar chemical properties occur at periodic intervals
Periodic law
Proposed a system of chemical symbols based on the first letter of their name and some based on their latin name
Jons Jakob Berzelius
arranged the element into groups of simble substances that do not decompose by any means
Antoine Lavoiser
made ea list of elements arranged by increasing atomic weight in spiral order
A.E beguyer de Chancourtois
He classified some elements into groups of three, which he called triads
- The element in triads had similar chemical properties and order;u physical properties
Johann Dobereiner
He suggested that elements be arranged in octaves because he noticed arranging the elements in order of increasing atomic mass) that certain properties repeated every after 8th element
John Newlands
arrange the elements according to its atomic weights mass
Lothar Meyer & Dmitri Mendeleev
A British chemist responsible for the arrangement of the periodic table in terms of atomic number
Henry Moseley
Horizontal tow of elements in a periodic table
Period
Vertical column of elements in the periodic table
group
General name for any element in Group IA of the periodic table
Alkali metal
General name for any element in Group IIA of the periodic table
Alkaline Earth metal
soft shiny metals that readily react with water
Alkali metal
soft,shiny metals but they are only moderately reactive towards water
Alkaline Earth metal
Group VIIA of the periodic table these are reactive elements that are gasses at room teperature
Halogen
Group VIII of the periodic table they are unreactive gasses that undergo few in any chemical reactions
Noble gas
is an element that has characteristics properties of luster, thermal conductivity, electrical conductivity and mellability
Metal
is an element characterized by the absence of the properties of luster, thermal conductivity, electrical conductivity and malleability
Non Metal
metallic apperance but they are brittle and only fair conductors of electricity
Metalloids
Chemical element is a measure of the size of its atom usually the neab or typical distance from 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
