HELP ME IN THIS QUESTION!!!
Calculate the atomic number and mass number of the elements X and Y from the following:
a) X- ion containing 18 electrons and 18 neutrons.
b) Y3+ ion containing 10 electrons and 14 neutrons.
Name the element X and Y.
Answers
Answered by
3
You know that this negative ion has a total of 18electrons surrounding its nucleus.
As you know, the net charge of an ion is given by the difference that exists between the number of protons located inside its nucleus and the number of electrons surrounding its nucleus.
net charge = no. of protons − no. of electrons
You can use the fact that the ion has a 2− net charge to determine the number of protonslocated inside its nucleus.
no. of protons=(2−)+18=18−2=16
So, you know that element X has 16 protonsinside its nucleus, i.e. an atomic number, Z, equal to 16.
The mass number of an atom, A, is given by the number of nucleons--protons and neutrons--located inside its nucleus
A=Z+no. of neutrons
This means that this particular isotope of X has
A=16+18=34
Now, in order to check whether or not this particular isotope is also the most abundant, you must grab a Periodic Table and look for the element that has Z=16.
You will find that element X is sulfur, S, and this particular isotope is sulfur-34, 34S
Notice that sulfur has an atomic mass of 32.066 u. The trick here is the fact that you can get the mass number of the most abundantisotope of sulfur by rounding its atomic mass to the nearest integer.
In this case, you have
32.066≈32
This means that the isotope that you're dealing with here, i.e. sulfur-34, is not the most abundant isotope of sulfur. The most abundant isotope of sulfur is, in fact, sulfur-32, 32S, which has a mass number equal to 32 because it contains 16protons and 16 neutrons inside its nucleus
hope it helps uu!!
As you know, the net charge of an ion is given by the difference that exists between the number of protons located inside its nucleus and the number of electrons surrounding its nucleus.
net charge = no. of protons − no. of electrons
You can use the fact that the ion has a 2− net charge to determine the number of protonslocated inside its nucleus.
no. of protons=(2−)+18=18−2=16
So, you know that element X has 16 protonsinside its nucleus, i.e. an atomic number, Z, equal to 16.
The mass number of an atom, A, is given by the number of nucleons--protons and neutrons--located inside its nucleus
A=Z+no. of neutrons
This means that this particular isotope of X has
A=16+18=34
Now, in order to check whether or not this particular isotope is also the most abundant, you must grab a Periodic Table and look for the element that has Z=16.
You will find that element X is sulfur, S, and this particular isotope is sulfur-34, 34S
Notice that sulfur has an atomic mass of 32.066 u. The trick here is the fact that you can get the mass number of the most abundantisotope of sulfur by rounding its atomic mass to the nearest integer.
In this case, you have
32.066≈32
This means that the isotope that you're dealing with here, i.e. sulfur-34, is not the most abundant isotope of sulfur. The most abundant isotope of sulfur is, in fact, sulfur-32, 32S, which has a mass number equal to 32 because it contains 16protons and 16 neutrons inside its nucleus
hope it helps uu!!
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Answered by
8
For X, atomic number=no. of electrons =18
mass number=no. of protons and neutrons =18+18=36
#no. of protons =no. of electrons in an atom.
In a similar way, atomic number of Y=10
Mass number of Y=24
Element X is Argon
Element Y is Neon.
mass number=no. of protons and neutrons =18+18=36
#no. of protons =no. of electrons in an atom.
In a similar way, atomic number of Y=10
Mass number of Y=24
Element X is Argon
Element Y is Neon.
thank u
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