12
Question
In Mendeleev’s periodic table, the vertical columns are called _i____________ and the horizontal rows are called ii_______.
In Mendeleev’s periodic table, the vertical columns are called _i____________ and the horizontal rows are called ii_______.
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Solution
The correct option is A
In the Mendeleev periodic table, the vertical columns are called groups and the horizontal rows are called periods.
In the Mendeleev periodic table, the vertical columns are called groups and the horizontal rows are called periods.
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