Gaseous element - Crossword Clue, Answer and Explanation

'gaseous element' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for nitrogen that I've seen before include "Main gas in air" , "Common gas, N" , "Atomic number 7" , "Gas forming about four-fifths of atmosphere" , "Major constituent of air" .)

I've seen this clue in the Penny Press, The Guardian, the Evening Standard, The Independent, The Mirror, The Telegraph, The Sun and The Times.

'gaseous element' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for fluorine that I've seen before include "Poisonous pale yellow gas" , "Element, symbol F" , "highly toxic stuff" , "Atomic number 9" , "Gaseous element" .)

I've seen this clue in the Penny Press, The Guardian, the Evening Standard, The Independent, The Mirror, The Telegraph, The Sun and The Times.

'gaseous element' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for hydrogen that I've seen before include "... ditto: symbol H" , "Lightest element" , "Flammable gas" , "Gaseous element" , "Combines chemically with oxygen to form water" .)

I've seen this clue in the Penny Press, The Guardian, the Evening Standard, The Independent, The Mirror, The Telegraph, The Sun and The Times.

'gaseous element' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for neon that I've seen before include "Atomic number 10" , "Brightly coloured advertising sign" , "One of the six inert gases" , "Type of lamp" , "Gaseous element, in advertising sign say" .)

I've seen this clue in The Telegraph.

'gaseous element' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for krypton that I've seen before include "Pry knot (anag) - gas" , "Gaseous element" , "Noble gas, Kr" , "Inert gas (symbol Kr)" , "Superman's world and a gas" .)

I've seen this clue in the Evening Standard.

'gaseous element' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for radon that I've seen before include "Element, symbol Rn" , "hazardous substance" , "Radioactive gas, linked to granite" , "Inert gas that occurs naturally" , "Colourless gas, atomic number 86" .)

I've seen this clue in the Evening Standard, the Sydney Morning Herald, The Mirror, The Telegraph, The Sun and The Times.

'gaseous element' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for xenon that I've seen before include "Chemical element" , "Heavy, colourless and odourless gas" , "Heavy gaseous element" , "One of the noble gasses" , "Gaseous element, Xe" .)

I've seen this clue in the Evening Standard, the Sydney Morning Herald, The Mirror, The Telegraph, The Sun and The Times.

Gaseous element (8)