At room temperature radon is a gas.
metal
Any use, radon is a radioactive and very dangerous gas !
A physical change doesn't involve chemical reactions, change of the molecule structure.The chemical reactivity is about the ability of an element or compound to realize chemical reactions.
Is it not the Police Department? The Army? Examples of phyical power. But you could say the imposition of tax is also state controlled power, no? So therefore the IRS.
a land formation
No.
a phyical model
Yes it is.
There Is Alot
Roman "noses".
strength
Physical. Melting is always a physical change.