1.

An element having 17 protons and 18 neutron calculate number of electrons atomic number and Mass number.

Answer»

Mass number= 17+ 18 =35. Q. The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons.

Given

no of electrons = 17

No of nuetrons = 18


no of protons = no of electrons


So no of protons = 17


Atomic number = no of electrons = no of protons


So atomic number = 17


Mass number = atomic no + no of nuetrons


So

Mass numb

er= 17+ 18 =35

Element of nucleus :

Protons:17

Neutron:18

So,  

=>Mass No. =17+18 = 35

And ,

=>No.  of electrons =17.  (as no. of electrons =no. of protons) 

And, 

=>Atomic No.  = 17

=>Name of element = Cl(chlorine)  


Hope it helps u.... ✌



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