Answer
Verified
452.1k+ views
Hint:
Electrons and protons consist of negative and positive charge respectively. Protons along with the neutrons form nuclei of an atom. James Chadwick discovered neutrons. The representation of any element is done by placing the mass number on the upper subscript and atomic number on the lower subscript.
Complete step by step answer:
-Isotones are those elements who have the same number of neutrons in the orbit.
-To calculate the number of neutrons we have to apply the formula that is:
Number of neutrons = Atomic mass - atomic number
-So, now we will apply this formula to all the element and we will get:
-In Argon, atomic mass is 40 and the atomic number is 18 so the number of neutrons will be
= 40 - 18 = 22
-In Calcium, atomic mass is 42 and the atomic number is 20 so the number of neutrons will be
= 42 - 20 = 22
-In Scandium, atomic mass is 43 and the atomic number is 21 so the number of neutrons will be
= 43 - 21 = 22
-In Scandium, atomic mass is 41 and the atomic number is 21 so the number of neutrons will be
= 41 - 21 = 20
-So, the pair of isotones are $\text{Ar}_{18}^{40}$, $\text{Ca}_{20}^{42}$and $\text{Sc}_{21}^{43}$ because they have an equal number of neutrons that is equal to 22.
Therefore, option A, B and C are the correct options.
Note:
Isotopes are those elements who have same no of electron pairs, for example, ${}_{6}^{12}\text{C, }{}_{6}^{13}\text{C and }{}_{6}^{14}\text{C}$ they have the same number of electrons but different mass i.e. 12, 13 and 14 respectively. Isobars are those elements which have the same mass number but a different atomic number. For example, $\text{C}{{\text{a}}^{20}}\text{ and }{{\text{K}}^{20}}$.
Electrons and protons consist of negative and positive charge respectively. Protons along with the neutrons form nuclei of an atom. James Chadwick discovered neutrons. The representation of any element is done by placing the mass number on the upper subscript and atomic number on the lower subscript.
Complete step by step answer:
-Isotones are those elements who have the same number of neutrons in the orbit.
-To calculate the number of neutrons we have to apply the formula that is:
Number of neutrons = Atomic mass - atomic number
-So, now we will apply this formula to all the element and we will get:
-In Argon, atomic mass is 40 and the atomic number is 18 so the number of neutrons will be
= 40 - 18 = 22
-In Calcium, atomic mass is 42 and the atomic number is 20 so the number of neutrons will be
= 42 - 20 = 22
-In Scandium, atomic mass is 43 and the atomic number is 21 so the number of neutrons will be
= 43 - 21 = 22
-In Scandium, atomic mass is 41 and the atomic number is 21 so the number of neutrons will be
= 41 - 21 = 20
-So, the pair of isotones are $\text{Ar}_{18}^{40}$, $\text{Ca}_{20}^{42}$and $\text{Sc}_{21}^{43}$ because they have an equal number of neutrons that is equal to 22.
Therefore, option A, B and C are the correct options.
Note:
Isotopes are those elements who have same no of electron pairs, for example, ${}_{6}^{12}\text{C, }{}_{6}^{13}\text{C and }{}_{6}^{14}\text{C}$ they have the same number of electrons but different mass i.e. 12, 13 and 14 respectively. Isobars are those elements which have the same mass number but a different atomic number. For example, $\text{C}{{\text{a}}^{20}}\text{ and }{{\text{K}}^{20}}$.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE
Which are the Top 10 Largest Countries of the World?
How do you graph the function fx 4x class 9 maths CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Why is there a time difference of about 5 hours between class 10 social science CBSE