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प्रश्न
What is the contribution of the following in atomic structure?
Democritus
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उत्तर
Democritus called paramanu as atom which comes from the Greek word atomos, meaning indivisible.
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संबंधित प्रश्न
Give electron dot diagram of the following:
methane
State differences between the properties of ionic compounds and covalent compounds.
State the following is a reduction reaction or oxidation reaction.
\[\ce{Pb -> Pb^2+ + 2e-}\]
Explain fractional atomic mass. What is the fractional mass of chlorine?
Explain
Octet rule for the formation of sodium chloride
Compare :
Sodium atom and sodium ion
Give the orbital diagram of the following:
Magnesium chloride
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.
Draw the electron distribution diagram for the formation of Carbon di oxide (CO2 ) molecule.
Complete the following table:
| a. | Dativebond | ______ |
| b. | CaH2 → Ca+H2 | ______ |
| c. | ______ | Reduction |
| d. | ______ | Redox reaction |
