DEVELOPMENT OF THE MODERN PERIODIC TABLE ~ AWESOME !
THE PERIODIC TABLE ~ Is a Logical Arrangement
HYDROGEN (1)* to URANIUM (92) of the Natural
ELEMENTS ! Developed by MENDELEEV (1869)
PEOPLE interested in CHEMISTRY saw the properties of
ELEMENTS were not all individually different ~ and
RESEMBLANCES were observed : Chlorine : Bromine
IODINE (Halogens). Also Lithium : Sodium : Potassium
ONE of the Metallic Groups. In the 20th C : We have .......
DISCOVERED this was due to their similar Electronic Structures !
In 1869 MENDELEEV characterised Families of Elements based on their
CHEMICAL (Valence etc) & PHYSICAL (Metals etc) properties !
THE PERIODIC TABLE was arranged in order of Atomic Masses. MENDELEEV
ACCURATELY predicted properties of then undiscovered ELEMENTS !
BARIUM (56) was above eka-BARIUM (88) : Discovered by the CURIES and
LABELLED RADIUM ! MENDELEEV travelled to Paris to thank them !
ELEMENTS combine to form MILLIONS of CHEMICAL COMPOUNDS !
Thanks for visiting ~ comments welcome ~ Love A & B 🧡🧡🧡
* Numbers in parenthesis are ATOMIC NUMBERS based on the
number of PROTONS in the Nucleus of the ATOM. There are no
missing elements in the modern Periodic Table. The Periodic
Table is one of the most unifying Concepts in Science. It enables
us to se the properties and Combining Power (VALENCE) of
individual Elements and whether they are METALS ~ NON-METALS
or METALLOIDS ! in the UK the PERIODIC TABLE is taught (see
Video) at KEY STAGE 4 (aged 14 to 16). CHEMISTRY is a very
exact SCIENCE & is governed by Facts ~ Patterns & Principles
throughout he whole of the Physical Universe. BRIAN & ANGELA.
2019 (150th Anniversary of the PT) is designated as ~
THE YEAR OF THE PERIODIC TABLE !