Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. General Characteristics of the f-block?
You know that the 14 elements from cerium (Z = 58) to lutetium (Z = 71), which follow lanthanum (Z = 57) in the periodic table, are known as lanthanides, lanthanons or lanthanoids. Note that some authors include lanthanum also in lanthanides, but there IS no general agreement on it. These elements are characterised by successive filling of 4f orbitals in their atoms. These elements along with yttrium and lanthanum were originally known as rare earth elements or simply rare earths. The word 'earth' was used because they occur as oxides, which in early usage meant earth, and the word rare was used because of the great hard in their separation from each other. Otherwise, these are not particularly rare in earth's crust. For illustration, lanthanum, neodymium and cerium are more abundant than lead. Even the scarcest of them, thulium, is as abundant as bismuth and more abundant than arsenic, cadmium, selenium, or mercury none of which is usually considered rare.
The fourteen elements from thorium (Z = 90) to lawrencium (2 = 103) following actinium in the periodic table are define as actinides, actinoids or actions. They are analogous to the lanthanides and result from the filling of the of orbitals as the lanthanides result from the filling of 4f orbitals. Prior to 1940, only the obviously occurring actinides, i.e., thorium, protactinium and uranium were known. The remaining actinides have been produced artificially since then and are collectively define as transuranium elements.
The number of unpaired electrons in carbon atom in excited state is: (1) One (2) Two (3) Three (4) Four Ans: Four
Why does methyl ethanoate not give iodoform test while ethyl ethanoate does? Ans) Iodoform test for esters is the test given by its products on hydrolysis methyl ethanoate give
brief explanation of claudes method of liquefication of g gases
Q. Illustrate Structure of the Water Molecule? Ans. A water molecule is composed of two hydrogen atoms and one oxygen atom covalently bonded together. The following anim
Hydride generation method: The hydride generation method of sample enhances the detection limits by a factor of 10 to 100 by converting the analyte element into a volatile hyd
what is the symmetry of a star
titration curve or eak acid and eak base
i am synthesing the azipines and i wana to fet the azipine with different subsituites. how can i get with triflouro subsituited azipines?
Examples of amperometric titrations
Nomenclature of Bicyclic compounds Several hydrocarbons and their derivatives include two fused or bridged rings. The carbon atoms are common to both rings are known as bridge
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd