chemistry for grade 7

7 molecule The outer electronic configuration of iodine atom is 5s 2 5p 5 . To make seven bonds, one s and two p orbitals are promoted to the higher vacant 5d orbitals as shown in fig.1.29 (b). fig 1.29 (b) - Pentagonal bipyramidal geometry of IF 7 molecul..

Main Features of the Long Form of the Periodic Table - 1. The properties of an element in the periodic table mainly depend on its outer electronic configuration, except in the case of transition elements. 2. Each period begins with an element having only one electron in the valence shell and ends w..

Occurrence - Chlorine belongs to the 'halogen' family. All the elements of this family are non-metals. They exhibit similar properties and they all form salts similar to sodium chloride. All the members of the group VII A are highly reactive, and they are not available in nature in the free state. ..

The electronic configuration of atom 'D' has seven electrons in the outermost shell. Each 'D' atom should share a pair of electrons with another 'D' atoms to form a substance containing only 'D' .i.e., Hence, the formula of the substance is D 2 . It is a covalent compoun..

Carbon dioxide is a natural constituent of the atmosphere and is vital to all forms of plant life. Animals and plants give it out in the process of respiration. However it is released mainly during the combustion of fuels at homes, factories, power stations, etc. An estimated seven bi..

Phosphorus atom has five electrons in its outermost shell. It needs three more electrons to complete its shell. One electron is required to complete a chlorine atom, as its outer shell has seven electrons. Thus, one phosphorus atom can share one electron pair with each of the three chlor..

The smallest three-dimensional portion of a complete space lattice, which when repeated over and again in different directions produces the complete space lattice. The size and shape of a unit cell is determined by the lengths of the edges of the unit cell (a, b and c) and by the angles a , b a..

Later, Mendeleev arranged the sixty-three elements known at that time in the increasing order of the atomic masses, in the form of a table called the Periodic Table. The periodic table further classified the elements by arranging the elements with similar properties together and separating the elem..

Hydrogen chloride is a polar molecule. Hydrogen atoms shares one electron with chlorine atom to complete its octet. Chlorine on the other hand has seven valence electrons, it needs one more to complete its octet. Chlorine has an electronegativity of three, while hydrogen atom has a elect..

has established fourteen different types of lattices called Bravais lattices according to the arrangement of the points in the different unit cells involved. These are listed below:..