A survey was conducted on a group of people to know the name of the co..
A survey was conducted on a group of people to know the name of the company they work for. The results are recorded in the following line plot. How many people among the group work for Company Z? => 2 or 3 or 5 or 4..
IUPAC Nomenclature for Elements with Z > 100
All elements beyond uranium (Z=92) are synthesized in the laboratories and are known as 'trans uranium elements'. The elements, beyond fermium (Z=100) are known as 'trans fermium elements'. These elements have atomic numbers 101 onwards. Elements like fermium (Z=100), ..
The population survey in 2002 stated that 18% of the women of ages 40 ..
The population survey in 2002 stated that 18% of the women of ages 40 to 44 were childless. To test this report, a statistician selected 200 women of the same age group and found that 38 of them were childless. At α = 0.01, does it differ from the population proportion? Write the ..
Normal Elements
In the case of these elements, all shells except the outermost shell are completely filled. Elements belonging to 1 (IA), 2 (IIA), 3 (IIIA), 4 (IVA), 5 (VA), 6 (VIA) and 7 (VIIA) are normal elements. Elements of the second period are known as typical elements [Li (Z = 3) to Ne (Z..
1. Atomic and ionic radii
The atomic and ionic radii of group 13 elements are compared to corresponding elements of group 2. This is due to the increase in nuclear charge when one moves from, element of group 2 to group 13 in the same period. As the elements are considered from left ..
Atomic Number
Atomic Number - The number of protons or the number of electrons in an atom in its normal state is called the atomic number and is denoted by Z. The nucleus of every element contains Z protons and some number of neutrons. The electrons, having the same charge as a proton but of ..
Allotropy
A characteristic property of the elements of groups 14 is that these show allotropy. Allotropy is the existence of an element in two or more forms, which are significantly different in physical properties but have similar chemical properties. The difference may be due to difference in cr..
Ecosystem Structure and Function Summary
Summary - The biotic and abiotic components form an interacting system called 'ecosystem'. Producers, consumers and decomposers are the various trophic levels, which are linked by their food relationship forming a 'food chain'. Several food chains are interrelated and interconnected to form a ..
Trends in Chemical Reactivity
Some important group trends are: (a) On account of high ionization enthalpies, simple M 4 + ions of the group are not known. (b) Unlike carbon the other elements of the group form compounds having coordination numbers higher than 4 like (SiF 5 ) - , (SiF 6 ) 2 - and (P..
Atomic Size and Atomic Radius
The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom (Fig. 2.1..
The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom (Fig. 2.1..See what our Users say :
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