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Friends We are going to post the topics for class 11 PCM from 1st of May or earlier. So it will be better for you if you get yourselves subscribed to the blog.

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Limitations of Mendeleev's Periodic Table

Mendeleev arranged 63 elements known at that time in the periodic table. According to Mendeleev “the properties of the elements are a periodic function of their atomic masses.” The table consists of eight vertical column called ‘groups’ and horizontal rows called ‘periods’ Limitations of mendeleev’s classification : (i) He could not assign a correct position of hydrogen in his periodic table, as the properties of hydrogen resembles both with alkali metals as well as with halogens. (ii) The isotopes of the same element will be given different position if atomic number is taken as basis, which will disturb the symmetry of the periodic table. (iii) The atomic masses do not increases in a regular manner in going from one elements to the next. So it was not possible to predict how many elements could be discovered between two elements.
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Statistics Formulas and Important Points

Mean Deviation=Sum of Deviations by Number of observations The Deviation here means the difference of the observations from any of the central tendencies. But mostly we take the Deviation from Mean or Median but not from Mode. Before we see more formulas we should see that the need for Mean Deviation is to get more accurate quantity to relate different quantities. Here are the steps for finding Mean Deviation: (a.) MD for Ungrouped Data We derive the desired Central Tendencies. We find the value of mod(x-a) for all x. We use the formula for calculating MD: (b.) MD for Grouped Data Types of Grouped Data Discrete Frequency Distribution Continuous Frequency Distribution   Discrete Frequency Distribution We find the desired Central Tendency by the formulas of basic Statistics. We find the value of mod(x-a) for all frequency and observations. We find the value of f×mod(x-a) for all frequency and observations. We find MD by this formula: For Central...
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