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More numbers! Beyond the numbers ūnus, duo, and trēs, almost all of the numbers in Latin are indeclinable. It’s worth being able to count at least to 10 or 20, but if you know a Romance language — like Spanish or French — these numbers tend to be a bit easier to recognize: Latin Spanish French 1 ūnus, -a, -um        un(o)        un 2 duo, duae, duo dos deux 3 trēs, tria tres trois 4 quattuor cuatro quatre 5 quīnque cinco cinq 6 sex seis six 7 septem siete sept 8 octō ocho huit 9 novem nueve neuf 10 decem diez dix The only other unusual number is the word for Latin, thousands, which is a third declension i-stem neuter plural, mīlia. This is actually treated as a noun, rather than an adjective, with the noun it is attributed to in the genitive e.g. decem mīlia Rōmānōrum in hāc cīvitāte habitant, “Ten thousand of Romans live in this state.” With a single thousand, however, we used the indeclinable form mīlle: mīlle Rōmānī in cōpiīs Caesaris sunt, “There are a thousand Romans in Caesar’s forces.” The use of the genitive with mīlia is a phenomenon known as the genitive of the whole or the partitive genitive; to hear more, watch this video:

Insert the ablative form of the missing word to complete the sentences: At that time, many Romans were not well. Illō [tempore], multī Rōmānī nōn valēbant. In those three years, our people were able to protect themselves. Istīs tribus [annis], noster populus sē cōnservāre poterant. Within four hours, Cicero will come. Quattuor [horis], Cicerō veniet. Don’t forget to add macrons! You can copy and paste letters with macrons into the word with these letters: ā ē ī ō ū

Match the following systems of numerical reckoning with the correct number forms:

What kind of third declension noun do the endings of trēs, tria most resemble?

Complete the following sentences with the correct forms of the numbers to reflect the image above: [tres] virī cīvitātem cōnservant. [unus] vir est bonus, sed istī [duo] virī malī dormiunt! [dormiō, dormīre, to sleep] Don’t forget to add macrons! You can copy and paste letters with macrons into the word with these letters: ā ē ī ō ū

Enter the numbers of electrons in the ion 65Cu2+.

Determine the number of atoms in 1.64 mL of mercury. The density of mercury is 13.5 g/mL.

Of the elements listed in the choices, which would be expected to have the most metallic character?

Which molecule would you expect to be a free radical?

Indicate the electron configuration for Fe3+