Name one element that does not tend to form any bonds

Helium. It is an inert gas, because its electrons are positioned in such a way so that it can't form any bonds.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance