The complex ion [cobr6]3− is a high-spin complex and absorbs light at a wavelength greater than 7.70×102 nm . how many unpaired electrons will be present in the complex?

c is the answer because when something is left after something evaporates that shows the chemical change.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

that tool would be a compass