What are horizontal rows and vertical columns in a Mendeleev's periodic table known as?

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Solution

Part 1: Mendeleev's Periodic Table
Mendeleev arranged the 63 elements known at that time in the increasing order of their atomic masses.
He suggested that the properties of elements are a periodic function of their atomic masses.
Part 2: Horizontal rows and vertical columns
The horizontal rows in Mendeleev's periodic table are known as periods.
The vertical columns in Mendeleev's periodic table are known as groups.

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Similar questions

Which of the following statement about the modern periodic table is correct?

(a) It has 18 horizontal rows known as periods. (b) It has 7 vertical columns known as periods.

In Mendeleev’s periodic table, the vertical columns are called _i____________ and the horizontal rows are called ii_______.

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