2.How many elements in total are gases?
3.in what group of elements do most of the gases belong to?
4.which of the gas elements is the lightest?
5.what is the most essential gas elements for living organisms?

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2.The gaseous element group; hydrogen (H), nitogen (N), oxygen (O), fluorine (F), chlorine (Cl) and noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) are gases at standard temperature and pressure (STP).

3.Group 8A (or VIIIA) of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

4.Hydrogen

5.Carbon, hydrogen, oxygen, and nitrogen are the most important elements. Small quantities of other elements are necessary for life. Carbon is the most abundant element in living matter. Nitrogen is continually re-circulated.

Explanation:

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LEONARDMENDIGORINGO LEONARDMENDIGORINGO · Answer 2

2.How many elements in total are gases?

ANSWER;

11 ...

>>The elements that are gases at room temperature are radon (Rn), xenon (Xe), krypton (Kr), argon (Ar), chlorine (Cl), neon (Ne), fluorine (F), oxygen (O), nitrogen (N), helium (He) and hydrogen (H).

3.in what group of elements do most of the gases belong to?

ANSWER;

Group 8A (or VIIIA)

>>of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn)

4.which of the gas elements is the lightest?

ANSWER;

Hydrogen (H) or Helium (He)

>>chemical element, inert gas of Group 18 (noble gases) of the periodic table.

5.what is the most essential gas elements for living organisms?

ANSWER;

>>Carbon, hydrogen, oxygen, and nitrogen are the most important elements. Small quantities of other elements are necessary for life.

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