Which statement below is true All the electrons determine an elements chemical properties.
The location and quantity of valence electrons determines an elements chemical property.
The location of valence electrons is the only thing that determines an elements chemical property
The quantity of valence electrons is the only thing that determines an elements chemical property

The location and quantity of valence electrons determines an elements chemical property.

Explanation:

The location of Valence electrons is in relation to the level and can impact what the atom will react with. The quantity of Electrons can also change what an atom will react with and what it's charge is (for example if an atom has a stable octet in it's second Valence level it generally won't react unless sufficiient heat energy is applied allowing an electron to jump to the third Valence. You can't have all the answers true because they contradict eachother therefore, my answer must be correct.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.