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प्रश्न
How are X-rays produced?
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उत्तर
When a beam of cathode rays is made to fall upon hard metallic targets like tungsten, X-rays are produced.
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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).
Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms a cation?
Give a reason
Physical properties of isotopes are different.
Identify the following reaction as either oxidation or reduction:
K - e- → K+
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^31_15P}\]
Number of valence electrons in carbon is ______.
______ is the only noble gas that does not have eight electrons in its valence shell.
Match the following:
| 1. | Atomic bond | a. | Oxygen and hydrogen |
| 2. | Atoms with different electronegativities | b. | acceptor bond |
| 3. | An atom that accepts electron pair | c. | covalent bond |
| 4. | Rusting of iron | d. | donor atom |
| 5. | An atom that provides electron pair | e. | oxidation |
| f. | ionic bond |
What is meant by a chemical bond?
