Imagine you are given a mystery element. it is, however, a discovered and known element. you may perform a maximum of two observations or tests to determine its identity. time and money is critical, so you need to prioritize your tests. if you can get by with a single test, you get 100 super-geek points from your research lab team. pick your two tests, number them as #1 and #2, and justify why you think these two will certainly be enough (and why the first might well be enough all by itself.) the available tests are classification into metal, non-metal, or metalloid, count of valence electrons, count of electron shells, atomic radius (error range: +/- 1 pm), electronegativity (error range: +/- 0.1), first ionization energy (error range: +/- 10 kj/mole), melting point (error range: +/- 10 c), and boiling point (error range: +/- 20 c).

#1 atomic radius.

Explanation:

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In this case, since time and money are critical and additional points are given if one test is used, the best one would be the determination of the atomic radius including the error range of +/-1 pm. This lies on the fact that the atomic radius varies group-by-group by no less than 5 pm per element. For instance, nitrogen's atomic radius is about 56 pm and oxygen's one 48 pm (difference is more than 5pm), therefore, even with the associated error, such technique will be accurate in the light of the identification of the mysterious element with just one test.

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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.

b. is the answer hoped i