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The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals.The term inert-pair effect is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of groups 13, 14, 15 and 16.
Xenon reversibly complexes gaseous M(CO) 5, where M=Cr, Mo, or W. p-block metals also bind noble gases: XeBeO has been observed spectroscopically and both XeBeS and FXeBO are predicted stable. [27] The compound Xe 2 Sb 2 F 11 contains a Xe–Xe bond, the longest element-element bond known (308.71 pm = 3.0871 Å). [28]
Dr. Dinesh Prasad Saklani is the director of NCERT since 2022. [2] In 2023, NCERT constituted a 19-member committee, including author and Infosys Foundation chair Sudha Murthy, singer Shankar Mahadevan, and Manjul Bhargava to finalize the curriculum, textbooks and learning material for classes 3 to 12. [4]
The p orbital can hold a maximum of six electrons, hence there are six columns in the p-block. Elements in column 13, the first column of the p-block, have one p-orbital electron. Elements in column 14, the second column of the p-block, have two p-orbital electrons. The trend continues this way until column 18, which has six p-orbital electrons.
Another report from 2013 stated that there were 229 million students enrolled in different accredited urban and rural schools of India, from Class I to XII, representing an increase of 2.3 million students over 2002 total enrolment, and a 19% increase in girl's enrolment. [31]
[26] [27] In another class XII textbook titled ‘Contemporary World Politics’ the Aksai Chin region was shown to be a disputed area and coloured in the same colour as China. According to the NCERT, the controversial map was not a map of India, but a map of East and South East Asia published by University of Texas at Austin. [28]
In the Indian education system of some Indian states, the Pre-University Course (PUC) or Pre-Degree Course (PDC) is referred to as intermediate or +2 course, which is a two-year senior secondary education course that succeeds the tenth grade (known as SSLC or SSC in such states, equivalent to sophomore in the US system) and precedes to the completion of a Senior Secondary Course.
From 2014, one more section was added to classes XI and XII. Now classes XI and XII have sections A to D. Section A: Computer sciences; Section B: Biological sciences; Section C: Commerce; Section D: Humanities; In January 2012, the school opened a new building for Primary Block(Class I - V) in the same campus, each class having four sections(A ...