Advertisements
Advertisements
प्रश्न
How many atoms of each kind are present in the following molecule:
Calcium oxide
Advertisements
उत्तर
Calcium oxide (CaO) has one atom of calcium and one atom of oxygen. The calcium atom valence shell has two electrons. As a result, it contributes two electrons to complete the octet, while oxygen requires two electrons to complete the outermost shell.
APPEARS IN
संबंधित प्रश्न
Define a chemical bond.
Name the following:
Metal with valency 2
Explain
Octet rule for the formation of sodium chloride
Explain
Duplet rule for the formation of hydrogen
Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of reducing agent.
Five atoms are labelled V to Z
| Atoms | Mass Number | Atomic Number |
| V | 40 | 20 |
| W | 19 | 9 |
| X | 7 | 3 |
| Y | 16 | 8 |
| Z | 14 | 7 |
- Which one of these atoms
(1) contains 7 protons;
(2) has an electronic configuration 2, 7? - Write down the formula of the compound formed by atoms X and Y.
Spot the error/correct the wrong statement:
In the formation of compounds, the inner shell electrons of an atom involved in bonding.
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 |
Choose the odd one out and write the reason:
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is chemically inert.
