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Write the electron configuration for the following elements. 

K=​​​​​

Co =

Hg = ​​​​    

Se=


Lithium isotope ratios are important to medicine, geology, astrophysics, and nuclear chemistry. Measurements of the 6Li/7Li ratio in a Standard Reference Material are given here. Do the two methods give statistically equivalent results


Write down the full electronic configurations for the ions

(a)Os2+

(b) At–.


The cpmpound Ag2S is a responsible for much of the tarnish found on silverware. Name this compound, and give the charge on the silver ion.
Barium sulfate is an ionic compound swallowed by patients before having an x-ray of their gastrointestinal tract. Write its formula.
An astringent is a compound that causes proteins in blood, sweat , and other body fluids to coagulate, a property put to use in deodorants. Two safe and effective astringents are the ionic compound of aluminum with sulfate ion and with acetate ion. Write the formulas of both.
The ionic compound containing ammonium ion and carbonate ion gives off the odor of ammonia, a property put to use in smelling salts for reviving someone who has fainted. Write formula for this compound.
Ringers solution, which is used intravenously to adjust ion concentration in body fluids, contains the ions of sodium, potassium, calcium, and chlorine. Give the names and symbols of these ions.
Is molybdenum more likely to form a cation or an anion? Why?
Calculate the formal charges of the atoms in CO, CO2 and CO3
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