Someone help me please- Im stuck, will give brainliest Which of the following ions is written correctly?

Select one:
a. Chlorine ion
b. Potassium ion
c. Oxygen ion
d. Sulfur ion

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit