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An element has an atomic number of 77, an atomic mass of 152, and is considered electrically neutral. How many protons, neutrons, and electrons does the element have? Please select the three correct values.

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Rinkhals Rinkhals · Answer 1 · 2018-11-01T04:00:25+01:00

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