Examples: hydrogen, helium, oxygen, fluorine, chlorine, argon, krypton, radon, xenon, neon, nitrogen.
Chemical elements may be solid, gas or liquid.
That is not true. Every element takes the form of a gas if it is sufficiently heated. In other words, all elements have some boiling point. For some elements the boiling point is very high, but it does exist.
No, krypton is a noble gas and does not exist in allotropes like some other elements. It is a colorless, odorless gas that is typically inert and does not readily form compounds with other elements.
some elements are not but are just chemically bonded. put simply, some is
Different gases yes with some trace elements
The state of the common elements on Mars are all either a solid, liquid, or a gas. Some of them are found as only a solid, or only a liquid, or only a gas, or 2 of them, or all 3.
Only group 18 elements have noble gas configuration. All other elements lack a noble gas electronic configuration.
A chemical substance is some form of liquid or solid (or gas!) made out of chemicals or elements.
No, substances can be elements or compounds. Elements are pure substances made up of only one type of atom, while compounds are made up of two or more different types of atoms chemically bonded together.
solid gas
The periodic table itself will not tell you if an element is a gas or not. All elements have a melting point and a boiling point. For this information you need to look at a table of the PROPERTIES of the elements. However, all the elements in column 18 and many of the elements towards the top of column 17 and to some extent 16 are gasses at room temperature, as are all the elements in row 1.
all noble gas elements