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Alkali Earth Metals

Periods are _...

Question

Periods are ___ (rows/columns) in the modern periodic table.

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Solution

In modern periodic table, elements are arranged in rows and columns. The horizontal rows are known as periods while the vertical columns are known as groups.

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Q. The highlighted row ‘Aa’ and column ‘Bb’ in the modern periodic table are called _____ and _____ respectively.

What are the horizontal rows in the modern periodic table called?

Q. Number of vertical columns in the modern periodic table are:

Q. The number of columns and rows present in the periodic table are ____ and ___

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.

(c) It has 18 vertical columns known as groups. (d) It has 7 horizontal rows known as groups.

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