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The atomic size decreases in a period from left to right.
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Important Questions on Classification of Elements and Periodicity in Properties
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The elements which has the maximum number of valence electron is
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Which among the following elements is a metalloid?
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As of now, total number of elements with atomic numbers placed in the periodic table is
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Which of the following elements exhibit variable valency?
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The elements with atomic numbers and belong to, respectively:
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Element M forms a chloride with the formula . Element M would most likely in the same group of periodic table as:
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An element forms a chloride with the formula , which is solid with a high melting point. would most likely to be in the same group of the Periodic Table as
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How does the ionisation energy of group elements vary ?
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What will be the symbol and name for the element with atomic number ?
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The last element of the - block in period is represented by the outermost electronic configuration:
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Elements present in any group have the same number of
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Consider the following radioactive decays
I. and
II.
In which case group of parent and daughter elements remains unchanged.
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How many of the following statements are correct?
(a) '' is the second most abundant element in the universe.
(b) the symbol for the element with atomic number is .
(c) Osmium has the highest density among all elements.
(d) Francium is the most electropositive element in the periodic table.
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Select the correct set of statements regarding change in properties, as we move from left ot right in the second period of periodic table.
(i) Atomic size decreases
(ii) Valency remains the same
(iii) Electronegativity increases
(iV) Metallic character decreases
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has a smaller first ionization enthalpy than . Consider the following statement:
(I) it is easier to remove electron than electron
(II) electron of is more shielded from the nucleus by the inner core of electrons than the electrons of
(III) electron has more penetration power than electron
(IV) atomic radius of is more than
(atomic number )
The correct statements are.
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The characteristics of elements and with atomic numbers, respectively, and are:
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The first ionization energy of magnesium is smaller, as compared to that of elements and , but higher than that of . The elements and , respectively, are :
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Decrease in ionic size in a period is observed in
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The IUPAC symbol for the element with atomic number would be:
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What would be the IUPAC name for the element with the atomic number ?
