Maharashtra SSC (Class 10) Periodic Classification of Elements — practice questions
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Practice Maharashtra SSC (Class 10) Periodic Classification of Elements in the app →In Dobereiner's triads, the atomic mass of the middle element is approximately equal to which value?Which property of elements did Dobereiner relate their chemical behaviour to when forming triads?Given the atomic masses S(32.1), Se(79.0) and Te(127.6), do these three elements form a Dobereiner triad?What was the main limitation of Dobereiner's triads as a method of classifying elements?According to Newlands' law of octaves, the properties of an element are similar to which other element in the Newlands compared the repetition of element properties to a pattern found in which field?Up to which element was Newlands' law of octaves found to be applicable?Which was a recognised limitation of Newlands' octaves?On what fundamental property did Mendeleev base the arrangement of elements in his periodic table?Mendeleev's periodic law states that properties of elements are a periodic function of their:In Mendeleev's periodic table, the vertical columns and horizontal rows are respectively called:Mendeleev left gaps in his table and named three undiscovered elements eka-boron, eka-aluminium and eka-silicoThe close agreement between Mendeleev's predicted properties for eka-aluminium and the actual properties of gaWhen the noble gases were discovered late in the nineteenth century, how were they accommodated in Mendeleev'sWhy did the discovery of isotopes pose a problem for Mendeleev's periodic table?Which pair of elements created an ambiguity in their sequence because they share the same whole-number atomic Which scientist showed using X-ray experiments that the atomic number equals the positive charge on the nucleuThe modern periodic law states that properties of elements are a periodic function of their:How many periods and groups are there in the modern periodic table?The two rows shown separately at the bottom of the modern periodic table are called:Which groups of the modern periodic table together constitute the s-block?The d-block elements of the modern periodic table are also known as:Relative to the zig-zag line drawn in the p-block, where are the metals located?Elements placed in the same group of the modern periodic table have the same number of:Elements that have the same number of electron-occupied shells belong to the same:Using the formula for shell capacity, what is the maximum number of electrons the M shell (n = 3) can hold?Although the M shell can hold 18 electrons, why does the third period contain only eight elements?What is the periodic trend in valency as one moves from left to right across a period?In what unit is atomic radius expressed, defined as the distance between the nucleus and the outermost shell?Why does atomic radius decrease while moving from left to right within a period?What happens to atomic size as one moves down a group of the modern periodic table?Among the period-2 elements Li, Be, B, C, N, O whose atomic radii are 152, 111, 88, 77, 74, 66 pm, which elemeThe tendency of a metal atom to lose its valence electrons and form a cation is called its:How does the metallic character of elements change while moving down a group?Why does the metallic character of elements decrease from left to right across a period?The tendency of a nonmetal atom to accept electrons and form an anion, which increases across a period, is calIn the halogen family (group 17), which member exists as a solid at room temperature?An element has the electronic configuration 2, 8, 2. To which group and period of the modern periodic table doIn which block of the modern periodic table are the nonmetals found?Among the group-2 alkaline earth metals Be, Mg, Ca, Sr, Ba, why does beryllium fail to react with water while