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प्रश्न
Name the metalloids in the first twenty elements.
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उत्तर
B (Boron), Si (Silicon).
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संबंधित प्रश्न
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
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
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Name the scientist who stated the modern periodic law.
Give the chemical formula of sodium sulphite
Give the chemical formula of calcium phosphate
Identify gas A in the following experiment.
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Give reason for the following:
Inert gases do not form ion.
