Question

Mass of total positive charge present in an atom is 16533 times to that of mass of electron.find the atomic number of this element.​

Answer 1

2, 8 , 9 , 2

2 , 8 , 18 , 1

2, 8 , 18 , 2

2 , 8 , 8 2

Answer :

3

Solution :

We know that mass of a proton is 1837 times that of an electron.

∴ Atomic number of element =551101837=30

∴ Electronic configuration of the element is 2 , 8 , 18 , 2