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An element has the electronic configuration 1s 2 , 2s 2, 2p 6 , 3s 2 , 3p 2 . Its valency electrons are: (1) 6 (2) 2 (3) 3 (4)4 Ans: 4
Nuclei tend to have more neutrons than protons at high mass numbers because: (1) Neutrons are neutral particles (2) Neutrons have more mass than protons (3) More neut
1. In water softening, which of the precipitates will settle out? 2. For particle sizes larger than 1μ in size 3. In non-ideal type II settling 4.The most usually used me
the increasing order(lower first) for the values of e/m (charge/mass) for e,p,n,a?
A copper tube 1 inch in diameter and 2 feet long is filled with steel balls of 1 inch in diameter. The space between the balls is filled with water. The specific gravity of steel i
bilogical importance of carbon coumpounds
structure and uses
The radius of electron in the first excited state of hydrogen atom is: (1) a 0 (2) 4a 0 (3) 2a 0 (4) 8a o
Differential extraction - Purification of organic compounds This technique is employed for the separation of an organic compound that solid or liquid from its aqueous soluti
#question.factors affecting thermogravimetric curves.
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