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Vlada [557]
3 years ago
11

PLEASE HELP! I really don’t understand! Thanks!

Chemistry
1 answer:
PIT_PIT [208]3 years ago
6 0

http://century.rochester.k12.mn.us/cms/One.aspx?portalId=3086882&pageId=6133921

Hope this helps!

Please mark brainliest. :)

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oxygen is a common oxidizing agent in nature. what change in the oxidation number of oxygen must occur if it is to be an oxidizi
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Answer is: the oxidation number of oxygen must decrease.

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Oxygen change oxidation number from 0 to oxidation number -2 (reduction) and carbon change from 0 to +4 (oxidation)

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Water is unusual because it expands as it freezes, Very few substances have this property. The reason liquid water is more dense
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Suppose you are trying to find the identity of an unknown pure substance. The valence electrons of the substance's atoms feel an
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Answer: Correct option is (D).

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Given that unknown element has larger atomic radii than potassium atoms and its valence electrons feel an effective nuclear charge of +1 which means that this unknown element belongs to group(I) of the periodic table.

In periodic table:

  • As we move down the group the value of ionization energy decreases down the group. This is due to increase in the size of an element.With increase in size valence electrons gets far away from the nucleus by which less energy will require to ionize the element.
  • Electronegative characters also decreases when we move down the group.This is due to increase in size of an element by which electrons present in valence shells are far away from the nucleus.

So,It would have lower ionization energies than K and a lower electronegativity value than K.



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3 years ago
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