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Which charge kept the electrons in the atom?
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Explanation:

Electrons are kept in the orbit around the nucleus by the electromagnetic force, because the nucleus in the center of the atom is positively charged and attracts the negatively charged electrons.

nucleus

Explanation:

Protons are positive, Neutrons have a 0 charge, and electrons are negative

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.