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प्रश्न
What is meant in the periodic table by a period?
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उत्तर
In a periodic table, elements are arranged in the order of increasing atomic numbers in horizontal rows called periods.
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संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Give two example of group 17 elements.
Give two example of group 18 elements.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
What is the usual number of valence electrons in the atoms of the last element in a period?
Name the scientist who stated the modern periodic law.
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Match the atomic number with the following:
An element of group 2.
