Which of the following elements has the lowest ionization energy Rb Na C F Which

Question

Which of the following elements has the lowest ionization energy Rb Na C F Which of the following is not true about none metals? Compounds entirely of none metals are molecular compounds Most none metallic oxides are acidic oxides They are not lustrous None of the above Which of the following is not true about periodic table trends of effect nuclear charge Effective nuclear charge steadily decreases down a group Effective nuclear charge increases from left to right across a period Going down a column, the Effective nuclear charge experienced by valence electron changes far less than it does a cross a period None of the above The size o f an atom generally increases Down a group from right to left across a period Up a group and from left to right across a period Down a group from left to right across a period Up a group from right to left across a period Up a group and diagonally across the periodic table The electronegativity value for N is 3.0 and that for O is 3.5. Based on these values, which of the following statements is TRUE about the compound NO? NO is a polar covalent compound NO is a pure covalent compound NO is an ionic compound There is not enough information to determine the nature of NO Trend in size of atomic radii Why?

Explanation / Answer

Solution.

6) A: Rb. Because rb has more no of shells comparisions with other metals. No of shells increases distanc between nucleus and outer most shell increases,hence ionisation potential decreases.
11) D:None of the above.(Remaining all are true about none metals)
12) C: Going down in a column.the effective nuclear charge is not depending on valence electron changes
13) A; down a group,due to the increase in shells.In period from right to left nuclear charge is decreases.
14) B: because,an elctro negativity difference is less than 1.9

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