What is representative elements

-
Representative Elements:-

   Element in which only the outer s / p electron subshell is incompletely filled are known as representative or normal elements.
    Elements of S and P - blocks , excluding the nobel gases are included in this category . These elements have the outer electronic configuration from ns¹ to np5 . Element of this type use only their outer shell electrons in the bonding with other atoms.

Popular posts from this blog

Tests of ammonia how to tests ammonia

-
Tests of ammonia: 1- It is detected by it's characteristics pungent odour. 2- It forms a dense white fumes of ammonium chloride with a drop of conc. HCL. 3- It gives a deep blue colour with CuSO⁴ solution. 4- It turns moist red litmus paper blue and moist turmeric paper brown. 5- It forms a reddish brown ppt with Nessler reagent.
Read more

E-cigarettes: How they work, benefits, and risks >...

-
Image
E cigarette Quick facts What are they? How they work Benefits Risks Recent research Takeaway The safety and long-term health effects of using e-cigarettes or other vaping products still aren’t well known. In September 2019, federal and state health authorities began investigating an  outbreak of a severe lung disease associated with e-cigarettes and other vaping products . We’re closely monitoring the situation and will update our content as soon as more information is available . An electronic cigarette is a battery-operated device that emits doses of vaporized nicotine, or non-nicotine solutions, for the user to inhale. It aims to provide a similar sensation to inhaling tobacco smoke, without the smoke. Also known as e-cigarettes, e-cigs, electronic nicotine delivery systems, vaporizer cigarettes, and vape pens, they are marketed as a way to stop or cut down on smoking. E-cigarettes have been taken up by millions around the world since they first appeared ...
Read more

F - block element What are f - block elements

-
What are F - Block Elements - F - block elements are consist of Lanthanides and Actinides. In Lanthanides, they are 14 element immediately following Lanthanum (57) from cerium (58) to lutecium (71) . These 14 element are called Lanthanides . These Lanthanides belong to first inner transition series .           In Actinides , these are also 14 elements immediately following Actinium (89) starting from Thorium (90) to lawrencium (103) . The element from Th (90) to Lr (103) are called Actinides . They belong to second inner transition series.
Read more