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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
Define a chemical bond.
Five atoms are labelled from 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 an electronic configuration 2, 7?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Sodium chloride is ______ compound while hydrogen chloride is ______ compound.
How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?
Name the following:
An element having valency 'zero'
Explain
Octet rule for the formation of sodium chloride
Draw orbit structure diagram of calcium oxide (CaO).
State the type of bond between Y and Z and give its molecular formula.
Identify the following reaction as either oxidation or reduction:
K - e- → K+
Number of valence electrons in carbon is ______.
