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.
how many type of atom?
why is filtration in soil and water a slow process and explain the colour change in the filtrate
Figure states energy differences for the combustion of hydrogen, an exothermic chemical reaction. The combination of oxygen gas and nitrogen gas to form nitrogen monoxide is an exa
I want to know how to determine the acid insoluble ash of a flour sample with principle,procedure as well as calculations.
why all scandium salt are white
Q. What are the Physical Properties of Halogens? Ans. The halogens exist as diatomic molecules held together by a single bond. Reactivity becomes less as you move down
Determine the alcoholic acidity of the given sample of flour. After undertaking this activity, you will be able to: • assess the acidity the given sample of flour, and •
density of gas is 2.86 ltr.the gas may be-
Synthesis of di and tri substituted benzenes
why are salts of alkali metals diamagnetic
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