【 】How Many Neutrons Does Selenium (Se) Have?||Number of Neutrons in Selenium

How Many Neutrons Does Selenium (Se) Have?

Answer:
Selenium has 45 neutrons for this isotope.

Explanation:

Hello, chemistry lover! today we are going to help you to find out  how many neutrons selenium (Se) have in just 3 steps.





To find out the number of neutrons  for  selenium (Se) ,we have to have knowledge about atomic number,atomic mass,mass number of  selenium (Se)  
.Click picture to see clearly.



                    Step-1:



●The atomic number of 
 selenium (Se)   is the number of protons in  selenium (Se)  's nucleus.



●The atomic mass of 
 selenium (Se)   is the average number of  protons plus neutrons of all the isotopes of  selenium (Se)  .


●The masss number of 
 selenium (Se)   is the number of protons plus neutrons of a specific isotope of  selenium (Se)  .



How Many Neutrons Does  selenium (Se)   Have?




                    Step-2:

We need to convert atomic mass of 
 selenium (Se)  to mass number of   selenium (Se)   by rounding if necessary (In case of fraction) .





From periodic table,


  ●Atomic number of 
 selenium (Se)  is 34.

●Atomic mass of  
selenium (Se)  is 78.96

●To find out mass number,we need to round 
78.96 to a whole number.So,by rounding,we are getting mass number of  selenium (Se) .The mass number of  selenium (Se) is 79
.




                    Step-3:

How Many Neutrons Does selenium (Se) Have?

By the difference between mass number and atomic number of 
selenium (Se)  ,we get the number of neutrons in selenium (Se)  .


●Number of neutrons=79-34=45

In another way,

●Mass number=Protons +Neutrons

Or,79 =34 +Neutrons

Or,79-34=Neutrons

Therefore,
Neutrons=45




Therefore,the number of neutrons in 
selenium (Se)   is 45 here for this isotope.Remember that neutrons are present in the nucleous of selenium (Se)  and it's charge is zero.

●Number of protons in 
selenium (Se) is 34.Protons are present in the nucleus of selenium (Se)  .



● Number of electrons in 
selenium (Se)   is 34.Remember that number of electron equals to proton in a neutral atom.Eletrons are present outside of nucleus of selenium (Se)  .


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