Thai Sikh International School
E-Learning Programme – Online
Assignment
Name
: Subject : Science
1. Sodium has only one stable isotope whereas
potassium has several isotopes.
(i) What do
you understand by the term isotopes?
(ii) How
many protons does sodium have in its nucleus?
Use the
Periodic Table to help you.
(iii) How
many electrons are there in an atom of potassium?
(iv) Uranium
has many isotopes. One of these is uranium-235 (235U).
What is the
main use of this isotope of uranium?
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