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?

Academic Chemistry NCERT Class 9

The pair of elements is known as Isobars.

Elements with different atomic numbers but the same mass numbers are known as isobars.

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Updated on: 19-Jan-2023

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Atoms of elements having the same mass number but different atomic number are called ?
What is the atomic number of argon?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic number 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
In the modern periodic table, the element calcium (atomic number = 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these elements has physical and chemical properties resembling those of calcium and why?
The mass number of two atoms X and Y is the same (40 each) but their atomic number are different (being 20 and 18 respectively). X and Y are examples of :(a) chemically similar atoms (b) isotopes (c) solid and liquid metals (d) isobars
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The atomic numbers of three elements A, B, and C are given below:Element Atomic number
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A, B and C are the elements of a Dobereiner’s triad. If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B?
What name is given to the pair of atoms such as 147N and 157N?
(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?(b) What is the number of elements in: (a) 1st period, and (b) 3rd period, of the modern periodic table?
The atomic species A and B have different number of protons but the same number of nucleons. On the other hand, the atomic species X and Y have the same number of protons but different number of nucleons. Which pair is an example of isobars ? Why ?
What are the mass number and the atomic number of an atom with 8 protons and 7 neutrons?
The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively.(a) Calculate the average atomic mass of elements X and Z. (b) How does the average atomic mass of elements X and Z compare with the atomic mass of element Y? (c) Which law of classification of elements is illustrated by this example? (d) What could the elements X, Y and Z be? (e) Give another example of a set of elements which can be classified according to this law.
The arrangement of elements in the Modern Periodic Table is based on theirincreasing atomic mass in the periodincreasing atomic number in the horizontal rowsincreasing atomic number in the vertical columnsincreasing atomic mass in the group

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