Chemistry
The diagram represents an isotope of hydrogen [H]. Answer the following:
![The diagram represents an isotope of hydrogen [H]. Are isotopes atoms of the same element or different elements. Do isotopes have the same atomic number or the same mass number. Atomic Structure, Simplified Chemistry Dalal Solutions ICSE Class 8.](https://cdn1.knowledgeboat.com/img/scd8/hydrogen-isotope-simplified-chemistry-icse-class-8-151x212.png)
Are isotopes atoms of the same element or different elements.
Do isotopes have the same atomic number or the same mass number.
If an isotope of 'H' has mass no. = 2, how many electrons does it have.
If an isotope of 'H' has mass no. = 3, how many neutrons does it have.
Which sub-atomic particles in the 3 isotopes of 'H' are the same.
Answer
Isotopes are atoms of the same element.
Isotopes have same atomic number.
Number of electrons in an isotope of 'H' having mass no. = 2 is 1 as its atomic number is 1.
Number of neutrons in an isotope of 'H' having mass no. [A] = 3 is 2, because, atomic number [Z] is 1 so number of protons = number of electrons = 1 and number of neutrons [n] = A - Z = 3 - 1 = 2.
Number of electrons and protons are same in the 3 isotopes of 'H' as atomic number is the same.
Related Questions
Match the statements in List I with the correct answer from List II.
List I List II 1. Mass number of an atom is the number of protons and A: Electron 2. The sub-atomic particle with a negligible mass. B: Argon 3. An atom having stable electronic configuration. C: Nitrogen 4. A molecule formed by sharing of electrons [covalency]. D: Sodium 5. A metallic atom having unstable electronic configuration. E: Neutrons Select the correct answer from the choice in bracket to complete each sentence:-
An element 'X' has six electrons in its outer or valence shell. Its valency is …………… [+2/-2/-1].
An element 'Y' has electronic configuration 2, 8, 6. The element 'Y' is a …………… [metal/non-metal/noble gas].
A …………… [proton/neutron] is a sub-atomic particle with no charge and unit mass.
An element Z with zero valency is a …………… [metal/noble gas/non-metal].
Magnesium atom with electronic configuration 2, 8, 2 achieves stable electronic configuration by losing two electrons, thereby achieving stable electronic configuration of the nearest noble gas …………… [neon/argon].
State the electronic configuration for each of the following:
Hydrogen [p = 1].
Boron [p = 5]
Nitrogen [p = 7].
Neon [p = 10]
Magnesium [p = 12].
Aluminium [p = 13].
Sulphur [p = 16].
Argon [p = 18].
Potassium [p = 19].
Calcium [p = 20].
Draw the structure of the following atoms showing the nucleus containing - protons, neutrons and the orbits with the respective electrons:
Lithium [At. no. = 3, Mass no. = 7].
Carbon [At. no. = 6, Mass no. = 12].
Silicon [At. no. 14, Mass no. = 28].
Sodium [At. no. = 11, Mass no. = 23].
Isotopes of hydrogen [11H, 12H, 13H]