An ionic bond is a bond which occurs when there is a
difference in the electronegativity of the atoms. One atom which has a stronger
electronegativity tends to steal the electron of the other less electronegative
atom hence making it more negative (anion), while the other becomes a cation.
So answer is:
<span>b. a cation and an anion</span>
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The formula units of NaNO3 that are in 2.99 moles of NaNO3 is
1.80 x 10^24 formula units
calculation
Use the Avogadro's constant to calculate the formula units
that is, 1 mole = 6.02 x10^23 formula units
2.99 moles =? formula units
by cross multiplication
= (2.99 moles x 6.02 x10^23 formula units) / 1 mole = 1.80 x 10^24 formula units
Nucleus
Because that’s where all the chemical cell activity decisions take place