The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Isotopes

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Isobars

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Both isotopes and isobars

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None of the above

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Solution

The correct option is B Isobars
Isobars are atoms having the same mass number but a different atomic number. The pair has the same atomic mass which is 40 and different atomic number 20 and 18 respectively.

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Q. Question 31
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Q. The atomic number of calcium and argon are

20

and

18

respectively, but the mass number of both these elements is

40

. Such pair is called:

Argon has atomic number of 18 and mass number of 40. Calcium has atomic 20 and mass number 40. Calcium and argon are examples of

An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of :

(a) chemically similar atoms

(b) isotopes

(d) isobars

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The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

The correct option is B IsobarsIsobars are atoms having the same mass number but a different atomic number. The pair has the same atomic mass which is 40 and different atomic number 20 and 18 respectively.

The correct option is B Isobars
Isobars are atoms having the same mass number but a different atomic number. The pair has the same atomic mass which is 40 and different atomic number 20 and 18 respectively.