Atomic structure

ATOMIC STRUCTURES

• I WILL BE ABLE TO DESCRIBE THE ATOMIC STRUCTURE OF AN ATOM.
• I WILL BE ABLE TO LIST THE CONTRIBUTIONS VARIOUS SCIENTISTS HAVE MADE
• TO DEVELOP AN ACCEPTED MODEL OF THE ATOM.
• I WILL BE ABLE TO EXPLAIN THE RELATIONSHIP BETWEEN THE ATOMIC NUMBER
• AND THE MASS NUMBER OF AN ELEMENT.

DALTON – SOLID SPHERES

• • Did his work in the late 1700s early 1800s
• • He said:
• All matter is made up of tiny, indivisible particles called atoms
• All atoms of an element are identical
• Atoms of different elements are different
• Atoms are rearranged to form new substances in chemical reactions but are never created or destroyed.

THOMPSON – ELECTRONS!

• Did his work in the late 1800s
• Using a cathode tube (think electron gun) he was able
• to discover that there were negative particles…he
• called them electrons
• Electrons were suspended in a positive charge – plum
• pudding

Folie 4