an x element has mass no. 35 and no. of neutrons 18 identify group no.and period of x
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Mass Number = 35
Neutrons= 18
Protons= Mass number - Neutrons
= 35-18
Protons= 17
Atomic number = Protons= 17
Electronic Configuration = 2,8,7
Group number can be found by finding the valence electrons and here it is 7
And hence it is a halogen which are found I group 17.
It is in period 3 as it has three shells and its electrons are arranged in 3 shells
2 in first shell
8 in second shell
7 in third or valence shell
Therefore, element x is in Group 17 Period 3.
Neutrons= 18
Protons= Mass number - Neutrons
= 35-18
Protons= 17
Atomic number = Protons= 17
Electronic Configuration = 2,8,7
Group number can be found by finding the valence electrons and here it is 7
And hence it is a halogen which are found I group 17.
It is in period 3 as it has three shells and its electrons are arranged in 3 shells
2 in first shell
8 in second shell
7 in third or valence shell
Therefore, element x is in Group 17 Period 3.
Answered by
0
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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