15. Elements in a group of the periodic table are described below. • A very reactive group
• Good conductor of thermal energy
• Good conductor of electricity
• Atoms contain a single valence electron

These elements most likely belong to which group? Write the answer on your answer document.

explanation:

since this is put under health, i would define "ethical (medical) behavior" the way the oath for doctors is recited.   "first do no harm."

but the term in general means when given a choice between right and wrong, we should always choose right. if we do, then we are practicing ethical behavior.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it