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The horizontal rows in Mendleev's table ...

The horizontal rows in Mendleev's table were called :

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To solve the question regarding what the horizontal rows in Mendeleev's table were called, follow these steps: ### Step-by-Step Solution: 1. **Understand Mendeleev's Table**: Mendeleev's periodic table organizes elements based on their atomic mass and properties. It consists of both horizontal and vertical arrangements. 2. **Identify the Arrangement**: In Mendeleev's table, the horizontal rows are referred to as "periods." Each period corresponds to a different energy level of electrons in the atoms of the elements. 3. **Count the Periods**: Mendeleev's periodic table contains a total of seven periods. This indicates the number of horizontal rows present. 4. **Differentiate Between Rows and Columns**: While horizontal rows are called periods, the vertical columns in Mendeleev's table are known as "groups." 5. **Conclude the Answer**: Therefore, the horizontal rows in Mendeleev's table are called "periods." ### Final Answer: The horizontal rows in Mendeleev's table were called **periods**. ---
To solve the question regarding what the horizontal rows in Mendeleev's table were called, follow these steps: ### Step-by-Step Solution: 1. **Understand Mendeleev's Table**: Mendeleev's periodic table organizes elements based on their atomic mass and properties. It consists of both horizontal and vertical arrangements. 2. **Identify the Arrangement**: In Mendeleev's table, the horizontal rows are referred to as "periods." Each period corresponds to a different energy level of electrons in the atoms of the elements. ...
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