What are the physical properties we use to classify metals, nonmetals, and metalloids? * 1) physical state, hardness, and mass
2) explosive, corrosive, and reactive
3) luster, conductivity, and malleability
4) reactivity, smell, and density

We have that  the the physical properties we use to classify metals are  Reactivity, Smell, and Density

Metals

Metals are materials that are higher conductors of heat and electricity the have free talent electrons that aids in conductivity

Nonmetals

These are materials that have a low conductivity of heat and electricity

Metalloids

These are the material that are found baring metal and non-metal properties mostly used as semi conductor

Generally,  

Metals,Non Metals and Metalloids are classified on the basis of their chemical properties.

Therefore

Reactivity, Smell, and Density are the the physical properties we use to classify metals

In conclusion

Reactivity, Smell, and Density are the the physical properties we use to classify metals

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Answer :

(3)

(4)

(5)

(7)

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

Gay-Lussac's Law : It is defined as the pressure of the gas is directly proportional to the temperature of the gas at constant volume and number of moles.

Avogadro's Law : It is defined as the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature.