Chemistry
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 |
Atomic Structure
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Answer
| List I | List II |
|---|---|
| 1. Mass number of an atom is the number of protons and | E: Neutrons |
| 2. The sub-atomic particle with a negligible mass. | A: Electron |
| 3. An atom having stable electronic configuration. | B: Argon |
| 4. A molecule formed by sharing of electrons [covalency]. | C: Nitrogen |
| 5. A metallic atom having unstable electronic configuration. | D: Sodium |
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Related Questions
'Valency' is also the number of electrons - donated or accepted by an atom so as to achieve stable electronic configuration of the nearest noble gas'. With reference to this definition -
(a) State what is meant by 'stable electronic configuration'.
(b) State why the valency of -
(i) sodium, magnesium & aluminium is: +1, +2 & +3 respectively.
(ii) chlorine, oxygen & nitrogen is: -1, -2 & -3 respectively.
With reference to formation of compounds from atoms by electron transfer - electrovalency, state the basic steps in the conversion of sodium & chlorine atoms to sodium & chloride ions leading to the formation of the compound - sodium chloride.
[electronic configuration of: Na = 2,8,1 & Cl = 2,8,7]
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].
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.