An atom has 18 protons and 8 valance electrons. Which statement would best identify this element.

argon

Explanation:

an element's atomic number is its number of protons, and argon has 18 protons. it is also a noble gas, which has 8 valence electrons.

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the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.