78) I can't find what this is please help
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Heya!
_________
Correct option is (a) magic Numbers
And the properties of elements repeat because they have similar valence electron configuration.
And chemical and physical properties of an element depends on number of electrons present in the outer shell.
And this repetition of valence electrons configuration similarity cause periodicity of elements in periodic table.
Periodicity in elements is repetition in properties of elements after regular intervals.
_________
Hope it helps...!!!
_________
Correct option is (a) magic Numbers
And the properties of elements repeat because they have similar valence electron configuration.
And chemical and physical properties of an element depends on number of electrons present in the outer shell.
And this repetition of valence electrons configuration similarity cause periodicity of elements in periodic table.
Periodicity in elements is repetition in properties of elements after regular intervals.
_________
Hope it helps...!!!
surbhiambashta2:
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Answer:
correct option is (a) heya mate
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