We know that Atomic Number of an Element indicates the Number of Protons in that Element.
Given that : The Element has an Atomic Number : 77
So, we can conclude that the Element has 77 Protons.
It is also given that : The Element is Electrically Neutral
We know that Electrically Neutral Atom has Equal number of Protons and Electrons
As the Number of Protons in the given Element are : 77
⇒ Number of Electrons in the given Element will be : 77
Given the Mass number of the Element as : 152
We know that Mass Number is the Sum of Protons and Neutrons
⇒ Number of Protons + Number of Neutrons = 152
⇒ 77 + Number of Neutrons = 152
⇒ Number of Neutrons = 152 - 77 = 75
So, the Given Element Contains :
Protons : 77
Neutrons : 75
Electrons : 77
