A) Properties of the element are given below: Where would you locate the following elements in the periodic table.a. A soft metal stored under kerosene oil.b. An element with variable valency(more than one) stored under water.c. An element which is tetra valent in organic chemistry.d. An element which is an inert gas with atomic number 2.B) Why does atomic size decreases from left to right in a period and increases down the group
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A). A soft metal which is kept under kerosene oil is sodium
B). The elements which is kept in water is phosphorus. Phosphorus is placed in Group 15 period 3
C). The element is carbon
D). The element is helium which is an inert gas having atomic number 2
2) in a period as we move from left to right addition of one electron take place due to which effective nuclear charge increases hence the electrons
are more strongly attracted towards nucleus. This results in decrease in atomic size
2) as we move down the group there is addition of new shell . which lead to increase in atomic size
B). The elements which is kept in water is phosphorus. Phosphorus is placed in Group 15 period 3
C). The element is carbon
D). The element is helium which is an inert gas having atomic number 2
2) in a period as we move from left to right addition of one electron take place due to which effective nuclear charge increases hence the electrons
are more strongly attracted towards nucleus. This results in decrease in atomic size
2) as we move down the group there is addition of new shell . which lead to increase in atomic size
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I hope you understand
by Shekhar raj
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