The number of protons uniquely identifes an element at all times, with no exceptions.
Helium always has two protons.
Helium is an element. By definition, elements are the most basic building blocks of matter. Therefore, the only chemical in Helium would be Helium.
hydrogen nuclei join together to make a larger helium.
Helium is an element with the chemical symbol He and atomic number 2, which means it has 2 protons in its nucleus. It is a noble gas and is known for being colorless, odorless, and inert under normal conditions.
It would by definition be Helium (atom number = number of protons = 2) but the nucleus of the stable isotope 4He also contains 2 neutrons (the mass number = total number of p's and n's = 4)
Mercury Hg -38.8' Now you could consider Hydrogen to be a metal if you are willing to get creative with the definition of metal. In that case it would be −259.16 °C
The worst would be a vacuum. The best probably depends on your definition of "best", but maybe something like superfluid liquid helium?
Inert has two common definitions. The most common is simply something that is not very active, I am inert in my bed. However, it also has a scientific definition when referring to gases that do not react to combustion, e.g. helium is an inert gas.
He - Helium
Yes, both gold and helium are made of subatomic particles. Gold is composed of atoms containing protons, neutrons, and electrons, while helium is a noble gas made up of atoms with two protons, two neutrons, and two electrons.
The symbol of Helium is He. Helium's atomic number is 2.
helium in a jar diff from helium atom
Because the sun is actually a star. Planets by definition Orbit a star. The sun does not orbit anything and is a huge ball of mainly Hydrogen and Helium.