14. Which of the following is acidic in Water (E) SO 3 It can react with water t

Question

14. Which of the following is acidic in Water

(E) SO3 It can react with water to form sulphuric acid  

1. Explain why atoms decreases in size as atomic number increases in a row of the periodic table?

The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. The atomic size decreases across the period because effective nuclear charge on the valance shall electrons increases.This is caused by increase in number of protons and electrons in period as a result one proton has greater effect compared to one electron. Electrons are pulled towards nucleus resulting in smallar atomic radius.The additional electrons go into the same outermost shell; whose radius gradually contracts, due to the increasing nuclear charge. In a noble gas, the outermost shell is completely filled.

For Ex: Li Be B C N O F no of protons in each atom are 3 4 5 6 7 8 9

So size of fluorine would be less as valance shell would contract due to strong nuclear attraction as compared to lithium which contains only three protons.

Explanation / Answer

C) SO2 D) CO2 E) CO 14) Which of the following is acidic in water? A) Cu(OH)2 B) MgO C) Fe2O3 D) NaOH E) SO3 Question 1 Scoring: 5 points Explain why atoms decrease in size as atomic number increases within a row of the periodic table. Your answer must make proper use of the terms effective nuclear charge, shielding (or screening) and valence shell. Answer briefly with complete, grammatical sentences.

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