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Choose the incorrect statement.
  • a)
    Chemical reactivity tends to be high in group 1 metals, lower in elements in middle and increases to maximum in the group 17
  • b)
    Halogens have very high negative electron gain enthalpy
  • c)
    Noble gases have large positive electron gain enthalpy
  • d)
    Decrease in electronegativities across a period is accompanied by an increase in non-metallic properties
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Choose the incorrect statement.a)Chemical reactivity tends to be high ...
Electronegativity increases across a period.
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Choose the incorrect statement.a)Chemical reactivity tends to be high ...

Incorrect Statement Explanation:

Decrease in electronegativities across a period is accompanied by an increase in non-metallic properties:
- This statement is incorrect because the decrease in electronegativities across a period is actually accompanied by an increase in metallic properties, not non-metallic properties.
- Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself in a chemical bond.
- As we move across a period from left to right, electronegativity generally increases. This means that elements on the left side of the periodic table (metals) have lower electronegativities compared to elements on the right side (non-metals).
- Metals tend to lose electrons and form cations, while non-metals tend to gain electrons and form anions. Therefore, a decrease in electronegativity across a period is associated with an increase in metallic properties, not non-metallic properties.

In conclusion, the statement that a decrease in electronegativities across a period is accompanied by an increase in non-metallic properties is incorrect.
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Choose the incorrect statement.a)Chemical reactivity tends to be high in group 1 metals, lower in elements in middle and increases to maximum in the group 17b)Halogens have very high negative electron gain enthalpyc)Noble gases have large positive electron gain enthalpyd)Decrease in electronegativities across a period is accompanied by an increase in non-metallic propertiesCorrect answer is option 'D'. Can you explain this answer?
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