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Q. Describe about groups or families in periodic table?
Every element may be represented by a one or two letter symbol. In the middle of nineteenth century a Russian chemist Dmitri Mendeleev saw that elements could be arranged according to repeating patterns of properties. Mendeleev's preparation has evolved into the periodic table of the elements that you can see inside the back cover of this Handbook. The vertical columns of elements are called as groups or families. The elements in a group have alike properties. A Horizontal row on the periodic table is called as periods. When a new period begins the elements tend to repeat the properties of the elements above them in the previous period. The value of Mendeleev's table was that it accurately predicted the properties of elements that had not yet been discovered.
what is the name materyal of use in plate choromatgraphy
dry air near sea level has the following composition by volume N2=78.08 percent,O2=20.94 percent. Calculate the partial pressure of each gas if atmospheric pressure is 1.00 atm
alkali metals belong to s-block in the periodic table.why?
In lab, you're having fun along with buffers based onto a 0.1 M solution of sodium phosphate at pH7.0. Into this system, there are three of pK A s as: 12.7, 7.21 and 2.12.
fajan rule state that large size highly negative charged ion form covalent bond
The state of a galvanic cell without liquid junction, when its temperature and pressure are uniform, can be fully described by values of the variables T, p, and ξ. Find an expressi
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Q.Waht are Standard Temperature and Pressure? Ans. The agreed set of conditions for comparison of gas volumes is called standard temperature and pressure (abbreviated
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