Which of these corresponds to different forms of the same element?

Which concept from quantum theory requires electrons in the same orbital in an atom to have opposite spins?

What is cobalt’s electron configuration?

Which of these is paramagnetic as an isolated gaseous atom? Note that the others are diamagnetic.

If you dilute a 0.981 M solution of NaNO2 from 50.0 mL to 4.00 liters total final volume, what will its new concentration be in moles/liter? M1 x V1 = M2 x V2

What volume of 6.2 M NaNO3 contains 0.55 moles of solute? M = n/V

Which of these is paramagnetic as an isolated gaseous atom? Note that the others are diamagnetic.

Which of these is the oxidizing agent in the reaction shown? HINT: Think about 2H2  + O2 à 2H2O(l) Cu(s)   +   NO31-   à  Cu2+     +    NO2(g)

Propylene glycol is an alternate antifreeze that is safely used in vet medicine. Analysis shows that it contains 47.32% carbon, 10.62% hydrogen and 42.06% oxygen. What is the simplest formula for this compound? HINT: % to mass, mass to moles, divide by smallest, multiply till whole.

What volume of 6.2 M NaNO3 contains 0.55 moles of solute? M = n/V