Astudent converted 68.0 km to meters their answer was 0.068m explain why this is incorrect and what is the likely source of error

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals