Arranging the Elements

download Arranging the Elements

of 7

  • date post

    25-Feb-2016
  • Category

    Documents

  • view

    36
  • download

    0

Embed Size (px)

description

Arranging the Elements. Dmitri Mendeleev. Russian chemist 1869 – discovered a pattern to the elements Grouped the elements according to their similar properties and eventually arranged them in order by atomic mass. THIS CREATED THE PERIODIC TABLE OF THE ELEMENTS. - PowerPoint PPT Presentation

Transcript of Arranging the Elements

Arranging the Elements

Arranging the Elements

Russian chemist1869 discovered a pattern to the elementsGrouped the elements according to their similar properties and eventually arranged them in order by atomic mass.

THIS CREATED THE PERIODIC TABLE OF THE ELEMENTS

Dmitri MendeleevWhere did the name come from??Periodic means happening at regular intervalsWhen arranged by atomic mass, the elements properties repeated themselves every seven elements.By using the pattern, Mendeleev predicted elements that hadnt been discovered yet!Periodic Table of the ElementsMendeleevs table had a few elements that didnt fit the pattern.Henry Moseley changed the table to be arranged by atomic number instead of atomic massthis fixed the problem.Changes to the arrangement

Atomic NumberAtomic MassMetalsFound to the left of the zig zag lineMost are solid at room temperatureNonmetalsFound to the right of the zig zag lineMore than are gases at room temp.MetalloidsAlso known as semiconductorsBorder the zig zag lineProperties of metals AND nonmetalsClasses of ElementsEach element is identified by a chemical symbol

2. Rows are called PeriodsPhysical and chemical properties of elements in a row follow a repeating (periodic) pattern

3. Columns are called GroupsGroups have similar chemical and physical propertiesDecoding the Periodic Table