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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.
Fill in the blank.
___________ single covalent bonds are formed between the carbon and chlorine atoms.
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'
What do you understand by redox reactions?
Explain the following:
Carbon-12 and carbon-14 both show similar chemical properties.
Identify the following reaction as either oxidation or reduction:
O + 2e- → O2-
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^23_11Na}\]
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^31_15P}\]
