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CBSE Class 10 Answered

Write down the anomalies in the Mendeleev’s periodic table. How were they removed in the modern periodic table
Asked by shubhangipatil9283 | 10 Dec, 2020, 19:20: PM
answered-by-expert Expert Answer
The Modern Periodic Table could remove various anomalies of Mendeleev's Periodic Table:
 
a) In the Modern Periodic table elements are arranged in the increasing order of their atomic number, removing the anomaly regarding certain pairs of elements in Mendeleev's periodic table.
 
b) Atomic number of cobalt is 27and nickel is 28. Hence cobalt will come before nickel even though its atomic mass is greater.
 
c) All isotopes of the same elements have different atomic masses, but same atomic number; therefore they are placed in the same position in the modern periodic table.
 
 
 
 
Answered by Ravi | 13 Dec, 2020, 00:20: AM
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CBSE 10 - Science
when we see far objects why does the focal length decreases and when we see near objects why does the focal length increase??
Asked by ahanafdo | 15 Jul, 2024, 23:38: PM
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CBSE 10 - Science
is the ratio of sin i/ sin r when incident ray propagates from glass to air equal to the ratio when it propagates from air to glass
Asked by saniakausar032 | 09 Jul, 2024, 18:29: PM
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CBSE 10 - Science
focal length of plane mirror is
Asked by niveepatel2110 | 06 Jul, 2024, 21:29: PM
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CBSE 10 - Science
An object's height is 3cm kept in front of a concave mirror of focal length 20cm. Find the (i) position of the image. (ii) nature of the image. (iii) size of the image. The position of the object is 10cm.
Asked by meenakshirautela782 | 05 Jul, 2024, 20:30: PM
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CBSE 10 - Science
If the image is a distance of 6 cm and the object is at 12 cm in the front of the concave mirror. Calculate the magnification formed
Asked by meenakshirautela782 | 24 Jun, 2024, 13:12: PM
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CBSE 10 - Science
If a object of mass 500 gm is dropped from a height of 100 m with a velocity of 10 m/s , then with will be the total kinetic energy before touching the land
Asked by mihirbasu0011 | 21 Jun, 2024, 16:00: PM
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CBSE 10 - Science
used in the design of solar furnaces explain how I temperature is achieved by this device
Asked by chanchalmourya28 | 02 Jun, 2024, 18:58: PM
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CBSE 10 - Science
Illustrate how mirrors are used in everyday applications such as periscopes or review mirrors. What opticals are opplied in these devices?
Asked by ganeshenterprisesballia3 | 25 May, 2024, 22:21: PM
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CBSE 10 - Science
give a test that can be use to differentially chemically between butter and cooking ?????
Asked by sramakrishnareddyrama | 23 May, 2024, 10:58: AM
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CBSE 10 - Science
the radius of curvature of a spherical mirror is 20cm what is focal length
Asked by sharmashivangi7355 | 22 May, 2024, 19:44: PM
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