Invented the present system of representing the elements usnig the first or another letter of their latin or english name



Yüklə 467 b.
tarix05.03.2018
ölçüsü467 b.
#30184





INVENTED THE PRESENT SYSTEM OF REPRESENTING THE ELEMENTS USNIG THE FIRST OR ANOTHER LETTER OF THEIR LATIN OR ENGLISH NAME.

  • INVENTED THE PRESENT SYSTEM OF REPRESENTING THE ELEMENTS USNIG THE FIRST OR ANOTHER LETTER OF THEIR LATIN OR ENGLISH NAME.

  • Symbols are written with the first letter in upper case.





From their discoverer/scientist – examples are Md, Lr, No, Es, Fm

  • From their discoverer/scientist – examples are Md, Lr, No, Es, Fm

  • From the place of discovery – examples are Fr, Mg, Sc, Am, Bk, Eu

  • From their properties – examples are









PERIODS – are the horizontal arrangements of elements in the p.t. (7 rows)

  • PERIODS – are the horizontal arrangements of elements in the p.t. (7 rows)

  • GROUPS/FAMILIES - are the vertical arrangements of elements in the p.t.

  • a. Int’l Union of Pure and Applied Chem (IUPAC) version – 1 through 18 groups, new version

  • b. Chemical Abstracts Service (CAS) version – Group A (I – VIII)  main or representative elements

  • - Group B (I – VIII)  transition elements



Metals, Nonmetals, Metalloids

  • Metals, Nonmetals, Metalloids

  • s,p,d,f blocks

  • http://www.gordonengland.co.uk/elements/blocks.htm



A Group

  • A Group

  • – main/representative elements

  • composed of metals & nonmetals & metalloids where s & p sublevels are filled up partially or completely

  • Group O

  • Are nonmetals at the end of each period

  • Also known as the noble or inert gases; they are very unreactive

  • Have completely filled the s & p sublevels except He.



B Group





Yüklə 467 b.

Dostları ilə paylaş:




Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©genderi.org 2024
rəhbərliyinə müraciət

    Ana səhifə