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Calculate the number of protons, electrons, and neutrons in an atom of the element Pb with mass number 207 and atomic number 82.



# P=

#E=

# N=

Answer :

Answer:p=82,e=82,n=125.

Explanation:

Let [tex]p[/tex] be the number of protons.

Let [tex]e[/tex] be the number of electrons.

Let [tex]n[/tex] be the number of neutrons.

Atomic number is defined as the number of protons in a atom or ion.

Given,atomic number is [tex]82[/tex].

So,[tex]p=82[/tex]

Since the atom is electrically neutral,number of protons and electrons are equal.

So,[tex]e=p=82[/tex]

The atomic mass is the sum of neutrons and protons.

[tex]n+p=207\\n=207-82\\n=125[/tex]

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