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प्रश्न
Name the following:
An element having valency 'zero'
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उत्तर १
Helium
उत्तर २
Element He, Ne, Ar i.e. Noble gases have ‘zero’ valency.
संबंधित प्रश्न
Give electron dot diagram of the following:
nitrogen
Among the following compounds identify the compound that has all three bonds (ionic, covalent and coordinate bond).
Five atoms are labeled A to E
|
Atoms |
Mass No |
Atomic No. |
|
A |
40 |
20 |
|
B |
19 |
9 |
|
C |
7 |
3 |
|
D |
16 |
8 |
|
E |
14 |
7 |
(a) Which one of these atoms:
(i) contains 7 protons
(ii) has electronic configuration 2,7
(b) Write down the formula in the compound formed between C and D
(c) Predict : (i) metals (ii) non-metals
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^23_11Na}\]
Sodium having atomic number 11, is ready to ______ electron/ electrons to attain the nearest noble gas electronic configuration.
The element that would form anion by gaining electrons in a chemical reaction is ______.
The element that would form cation due to the loss of electrons during the chemical reaction is ______.
______ theory explains the formation of molecules.
______ is the only noble gas that does not have eight electrons in its valence shell.
Match the following:
| 1. | Monoatomic gaseous atom | a. | Electrovalent bond |
| 2. | Octet rule | b. | Benzene |
| 3. | Ionic bond | c. | Water |
| 4. | Non-polar solvent | d. | Electronic theory of valence |
| 5. | Polar solvent | e. | Noble gases |
