Electronegativity increases as the size of the atom increases. a. True b. False

1 answer:

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B. False. Electronegativity is the property of an atom or element to attract electrons during a chemical reaction. If you look at the periodic trend for electronegativity you see Flourine has the highest electronegativity and Francium is the lowest. However, Francium has the largest atomic radius and Fluorine has the smallest (aside from Hydrogen and Helium). So your statement is false. The relationship between atomic radius and electronegativity is inversely proportional so a true statement would be: As atomic radius increases, electronegativity decreases.

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C) How much energy was added to the substance to increase molecule motion?

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The most relevant question to ask regarding this change must take into account the physical knowledge about matter.

When matter changes from liquid state to gaseous state, a physical change called evaporation, the particles (molecules or atoms) of the pure substance will separate from each other, take up more space and move faster.

Condensation is the opposite to evaporation, thus the option A) is not the most relevant question.

The charge of the particles does not change; so the option B) is not relevant at all.

The particles should gain energy from the surroundings to increase their motion (kinetic energy) when they pass from liquid state, where they move slower, to gas state, where they move faster. Hence, the option C), How much energy was added to the substance to increase molecule motion? , is totally relevant.

Since this is an increase in the kinetic energy of the molecules, the option D) is not relevant.

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