1. select the more electronegative element in this pair. a. f b. br 2. select the more electronegative element in this pair. a. se b. o 3. select the more electronegative element in this pair. a. si b. n 4. select the more electronegative element in this pair. a. mg b. na

F

O

N

Mg

Explanation

The key explanation here is that we need to know the trends in electronegativity value increase or decrease across the periods and down the group.

Across the periods, electronegativity is expected to increase. Hence, with the exception of the noble gases, the most electronegative elements are found further right on the periodic table. While electronegativity is expected to increase across the period, it decreases down the group.

Hence, if two elements are in the same group, further down we have the one with the less electronegative value. If two elements are in the same period, further right we have the more electronegative element.

1. F 2. O 3. Mg

Explanation: For electronegativity the trend are as follows.

Moving up group increases the electronegativity so F is in Group 7 together with Br. O and Se is in group 6. For Na and Mg the trend for elements in the same periods is electronegativity increases from left to right.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.