The rows of mendeleevs periodic table are called

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Explanation:

The rows in mandeleevs periodic table are called period OR group

But virtical column are period

&

horizontal colum are group

according to greek mythology, persephone, the queen of the underworld, was the daughter of zeus and demeter, the goddess of harvest and fertility. she was also called kore, which means "maiden" and grew up to be a lovely girl attracting the attention of many gods.

explanation:

b. the 200th birthday of the united states