Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.
Answer:
8.3028894e-22
Explanation:
5x10^2 atoms/1 x 1 mol/6.022x10^23
1s^2 2s^2 2p^6 for the Mg2+ ion.
Standard equation would be N2(g)+3H2(g)==>2NH3(g), so through stoichiometry, (4 mol N2)(2mol NH3/1 mol N2), assuming excess H2, would yield 8 moles of NH3.
Protons = 20
Electron = 20
Neutrons = 20
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