an element Xhas mass no.35 and the number of neutrons is 18.identify the group no.and period of X
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The no of electrons must be 17 as the no of prontons are (35-18)=17
And the electronic configuration will be 2,8,7
so the Group will be 10 + no of electrons in last orbit =10+ 7 = 17
And the period will be 3 as the no of orbits involved are 3.
period 3, group 17 in modern periodic table
And the electronic configuration will be 2,8,7
so the Group will be 10 + no of electrons in last orbit =10+ 7 = 17
And the period will be 3 as the no of orbits involved are 3.
period 3, group 17 in modern periodic table
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Answer:
We know :
Atomic number = Mass number - No. of neutrons.
Atomic number = 35 - 18
= > 17
Electronic configuration :
2 , 8 , 7
Group no. = 17
Period no. = 3
Name of element is Chlorine ( Cl ) .
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