Answer:
CaKr Na2S BaCl3 MgF. CaKr-Kr is a noble gas Na2S-not balanced BaCl3-not balanced MgF-not balanced.
Explanation:
Answer:
This is a physical test. A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. ... Benedict's reagent will give a positive test result for glucose but not for starch.
Explanation:
please give me brainlist and follow
Answer:
<u>The effective nucleus charge increases on going from left to right.</u>
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Explanation:
There are two factors that determine the atomic size of the atom.
1. Shielding constant :It is the shielding of the outershell electron from the nucleus by the inner shell electron. Thses are repulsive forces.If the value of shielding contant is more , then the size of the element increases.
2.The Effective Nuclear Charge : The net attraction of the nucleus felt by the electron present in the outermost shell . It is represented by Zeff.
This is attractive force.
If the Zeff is more then the nucleus of the element will pull the electron cloud more strongly.This leads to decrease in the size of the element.
On going left to right ,each time one electron is added to the element .This electron attracts the nucleus more strongly<u><em>(the nucleus is Positive charge and the electron is negative charge, opposite charge attracts each other</em></u>). Hence , the size decreases.
Thus, in period two , there is decrease in the atomic radius with increasing atomic number because the effective nuclear charge increases on going from left to right.
The atomic number for iodine (I) = 53
The electron for I is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
Now, among the noble gases, Krypton (Kr) has an atomic number 36. Thus we can write:
I = [1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ ] 5s² 4d¹⁰ 5p⁵
I = [Kr] 5s² 4d¹⁰ 5p⁵
(or)
I = [Kr] 4d¹⁰ 5s² 5p⁵
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