Sub-atomic particles like negatively charged electrons, positively charged protons and electrically neutrons​

neutral

Explanation:

There are three basic subatomic particles. These are;

A neutron has no charge unlike the proton and the electron. It is present in the nucleus and contributes to the mass of the atom.

the temperature of the gas, in k, not celsius.

answer:

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