【3 Steps】How Many Neutrons Does Lanthanum(La) Have?||Number of Neutrons in Lanthanum (La)
How Many Neutrons Does
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Lanthanum(La) Have?
Hello, chemistry lover! today I am going to help you to find out how many neutrons lanthanum(La) have in just 3 steps.
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Descriptio
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To find out the number of neutrons for lanthanum(La),we have to have knowledge about atomic number,atomic mass and mass number of lanthanum(La).
.Click picture to see clearly.
Step-1:
●The atomic number of lanthanum(La) is the number of protons in lanthanum(La)'s nucleus.
●The atomic mass of lanthanum(La) is the average number of protons plus neutrons of all the isotopes of lanthanum(La) .
●The masss number of lanthanum(La) is the number of protons plus neutrons of a specific isotope of lanthanum(La) .
Step-2:
We need to convert atomic mass of lanthanum(La) to mass number of lanthanum(La) by rounding if necessary (In case of fraction) .
From periodic table,
●Atomic number of lanthanum(La) is 57.
●Atomic mass of lanthanum(La) is 138.9
●To find out mass number,we need to round 138.9 to a whole number.
So,by rounding,we are getting the mass number of lanthanum(La).The mass number of lanthanum(La) (we are getting) is 139.
Step-3:
By the difference between mass number and atomic
number of lanthanum(La),we get the number of neutrons in lanthanum(La).
●Number of neutrons=139-57=82
In another way,
●Mass number=Protons +Neutrons
Or,139 =57+Neutrons
Or,139-57=Neutrons
Therefore,
Neutrons=82
Therefore,the number of neutrons in lanthanum(La) is 82 here for this isotope.Remember that neutrons are present in the nucleous of lanthanum(La) and it's charge is zero.
●Number of protons in lanthanum(La) is 57.Protons are present in the nucleus of lanthanum(La) .
● Number of electrons in lanthanum(La) is 57.Remember that number of electron equals to proton in a neutral atom.Eletrons are present outside of nucleus of lanthanum(La) .
Continue
To find out the number of neutrons for lanthanum(La),we have to have knowledge about atomic number,atomic mass and mass number of lanthanum(La).
.Click picture to see clearly.
Step-1:
●The atomic number of lanthanum(La) is the number of protons in lanthanum(La)'s nucleus.
●The atomic mass of lanthanum(La) is the average number of protons plus neutrons of all the isotopes of lanthanum(La) .
●The masss number of lanthanum(La) is the number of protons plus neutrons of a specific isotope of lanthanum(La) .
Step-2:
We need to convert atomic mass of lanthanum(La) to mass number of lanthanum(La) by rounding if necessary (In case of fraction) .
From periodic table,
●Atomic number of lanthanum(La) is 57.
●Atomic mass of lanthanum(La) is 138.9
●To find out mass number,we need to round 138.9 to a whole number.
Step-3:
By the difference between mass number and atomic
number of lanthanum(La),we get the number of neutrons in lanthanum(La).
●Number of neutrons=139-57=82
In another way,
●Mass number=Protons +Neutrons
Or,139 =57+Neutrons
Or,139-57=Neutrons
Therefore,
Neutrons=82
Therefore,the number of neutrons in lanthanum(La) is 82 here for this isotope.Remember that neutrons are present in the nucleous of lanthanum(La) and it's charge is zero.
●Number of protons in lanthanum(La) is 57.Protons are present in the nucleus of lanthanum(La) .
● Number of electrons in lanthanum(La) is 57.Remember that number of electron equals to proton in a neutral atom.Eletrons are present outside of nucleus of lanthanum(La) .
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