Science - Teachers Sri Lanka

Annex 1.2.2
Instructions for group exploration
² Focus your attention to the six atoms assigned to your group, according to the table given
below.
Data of some atoms
Symbol
(not the
standard )
A B C D E F G H I J K L M N O P Q R S T U V W X
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Number of
Protons
1 4 1 12 17 19 2 6 7 13 6 18 3 8 11 8 15 20 5 9 10 14 10 16
Number of 1 4 1 12 17 19 2 6 7 13 6 18 3 8 11 8 15 20 5 9 10 14 10 16
Electrons
Number of 1 5 2 12 18 20 2 6 7 14 7 22 4 8 12 9 16 20 6 10 10 1412 16
Neutrons
Group i Group ii Group iii Group iv
² Using data given in the table and the artical " Looking at the atom with an exploratory eye"
find the standard chemical symbols to the elements provided to you.
² Find the atomic mass and mass number of the atoms provided to you by using the types of
sub atomic particals and their numbers.
² Develope the eletronic configuration of the respective elements by writing the number of
eletrons in the cells from closer to the nucleus outwards.
² Develope using the letter discuss about isotopes and relative atomic mass and find out the
facts.
² Select necessary item from the common table and construct solar models of atoms allocated
to you.
² Be prepared to present constructions and findings to the class.
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