I think the correct answer is traits. Please brainiest me! :)
Answer: 
: Pure substance, Element
: Pure substance , Element
: Pure substance, Compound
Explanation:
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: 
and
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example:
Heterogeneous Mixture : Mixture that has its different components mixed unevenly within the substance
. Example: Air
Homogeneous Mixture : Mixture that has its different components mixed evenly within the substance. Example: sugar dissolved in water
Which atom?
Atomic mass - proton
Answer:
1. Gases may be compressed
2. Gases expand when less pressure is applied.
3. Gases can be mixed.
4. Gases exert a constant pressure on its container walls.
5. Gases have low densities.
Real gas particles have more complex interactions than ideal gas particles.
Explanation:
Real gases do not behave exactly like ideal gases because real gas particles have more complex interactions than ideal gas particles.
At high pressures and low temperatures, a gas tends to deviate from ideality.
- In an ideal gas molecules are not taking up space in the gas volume and intermolecular attractions are not pulling the particles closer to each other.
- This condition is true when the gases are at low pressures and high temperature.
- At a high pressure and low temperature, the gas deviates.
- Under this condition, the gas becomes less energetic and intermolecular attraction becomes appreciable.
learn more:
Ideal gas brainly.com/question/9321544
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