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a. rtęć (Hg) - 200,59 u ≈ 200u
b. magnez (Mg) - 24,3050u ≈ 24u
c. wapń (Ca) - 40,078u ≈ 40u
d. krzem (Si) - 28,0855u ≈ 28u
e. żelazo (Fe)- 55,845u ≈ 56u
2.
a. Cl₂= 2x35,5u=71u (cząsteczka chloru)
b. P₄= 4x31u=124u (cząsteczka fosforu)
c. KBr=40u+80u=120u (bromek potasu)
d. H₂S= 2x1u+32u=34u (siarkowodór)
e. NH₃=14u+3u=17u (cząsteczka amoniaku [wodorku azotu(III)])
f. Na₂SO₄=2x23u+32u+4x16u=46u+32u+64u=142u (siarczan (VI) sodu)
g. (NH₄)₂CO₃=2x14u+8x1u+12u+3x16u=28u+8u+12u+48u=96u (węglan (IV) amonu)
h. Mg₃(PO₄)₂=3x24u+2x31u+8x16u=72u+62u+128u=262u (fosforan (V) magnezu)
i. MgO=24u+16u=40u (tlenek magnezu)
j. NaF=23u+19u=42u (fluorek sodu)
k. CaO=40u+16u=56u (tlenek wapnia)
l. H₂SO₄=2u+32u+64u=98u (kwas siarkowy (VI)