Copper consists of two isotopes, Cu 63 (having relative abundance 69 % ) and Cu 65 (having relative abundance 31 % ). What is the relative atomic mass of copper?

Given, copper consists of two isotopes: isotope 1 , Cu 63 and isotope 2 , Cu 65 . The relative atomic mass of copper is = [ ( atomic mass of 1 × atomic mass of 2 ) + relative abudance percent of 1 × relative isotope abudance of 2 ) ] sum of their atomic masses = 69 × 63 + 31 × 65 69 + 31 = 63 . 62 . The relative atomic mass of an element is defined as the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon- 12 .

Copper consists of two isotopes, Cu 63 (having relative abundance 69 % ) and Cu 65 (having relative abundance 31 % ). What is the relative atomic mass of copper?

Given, copper consists of two isotopes: isotope 1 , Cu 63 and isotope 2 , Cu 65 . The relative atomic mass of copper is = [ ( atomic mass of 1 × atomic mass of 2 ) + relative abudance percent of 1 × relative isotope abudance of 2 ) ] sum of their atomic masses = 69 × 63 + 31 × 65 69 + 31 = 63 . 62 . The relative atomic mass of an element is defined as the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon- 12 .

The composition of two atomic particles is given below: X Y Proton 8 8 Neutron 8 9 Electron 8 8 What is the mass number of X ?

The mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. So, the mass number of X = Number of protons + Number of neutrons = 8 + 8 = 16 . Atoms of different elements which have different atomic numbers, but the same mass number are known as isobars.

The composition of two atomic particles is given below: X Y Proton 8 8 Neutron 8 9 Electron 8 8 What is the mass number of Y ?

The mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. So, the mass number of Y = Number of protons + Number of neutrons = 8 + 9 = 17 . Isobars have the same mass number but different atomic numbers.

The composition of two atomic particles is given below X Y Proton 8 8 Neutron 8 9 Electron 8 8 What is the relation between X and Y ?

The mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. The atomic number is the number of protons in the nucleus of an atom. Both the elements have the same number of protons, that is 8 . But, the mass number of X is 16 and the mass number of Y is 17 . So, they are isotopes as they have the same atomic number but different mass number.

The composition of two atomic particles is given below: X Y Proton 8 8 Neutron 8 9 Electron 8 8 Which element/elements do they represent?

Both X and Y have the same number of protons or same atomic number, but different mass numbers. Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. Atoms of the same element having the same atomic number, but different mass numbers are known as isotopes. Thus, X and Y are isotopes and represent the same element oxygen, as the atomic number is 8 .

E M B I B E

Chemistry for Class IX>Chapter 4 - Structure of the Atom>Exercise>Q 3

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Copper consists of two isotopes, ${}^{63}{Cu}$ (having relative abundance $69 %$ ) and ${}^{65}{Cu}$ (having relative abundance $31 %$ ). What is the relative atomic mass of copper?

Important Questions on Structure of the Atom

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Chemistry for Class IX>Chapter 4 - Structure of the Atom>Exercise>Q 1

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 a different number of nucleons. Which pair is an example of isobars? Why?