(a) What is the main characteristic of the last elements in the periods of the periodic table ?
(a) What is the main characteristic of the last elements in the periods of the periodic table ?
What is the general name of such elements ?
(b) What is the number of elements in : (a) 1st period, and (b) 3rd period, of the modern\ periodic table ?
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(a) The main characteristic of last elements in a period is that they all have 8 valence electrons in their atoms except helium. Such elements are called noble elements.
(b) (i) 2
(ii) 8.
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