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According to Mendeleev' periodic law, th...

According to Mendeleev' periodic law, the elements were arranged in the periodic table in the order of

A

increasing atomic number

B

decreasing atomic number

C

increasing atomic masses

D

decreasing atomic masses

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**Step-by-Step Solution:** 1. **Understanding Mendeleev's Periodic Law**: Mendeleev's periodic law states that the properties of elements are a periodic function of their atomic masses. This means that when elements are arranged in order of increasing atomic mass, elements with similar properties appear at regular intervals. 2. **Arrangement of Elements**: According to Mendeleev, elements were arranged in the periodic table in the increasing order of their atomic masses. This arrangement allowed Mendeleev to group elements with similar chemical properties together. 3. **Comparison with Modern Periodic Law**: It's important to note that the modern periodic law, which is based on atomic number rather than atomic mass, was developed later. However, Mendeleev's approach was significant in the development of the periodic table. 4. **Conclusion**: Therefore, according to Mendeleev's periodic law, the correct answer to the question is that the elements were arranged in the increasing order of their atomic masses. **Final Answer**: According to Mendeleev's periodic law, the elements were arranged in the increasing order of their atomic masses. ---
**Step-by-Step Solution:** 1. **Understanding Mendeleev's Periodic Law**: Mendeleev's periodic law states that the properties of elements are a periodic function of their atomic masses. This means that when elements are arranged in order of increasing atomic mass, elements with similar properties appear at regular intervals. 2. **Arrangement of Elements**: According to Mendeleev, elements were arranged in the periodic table in the increasing order of their atomic masses. This arrangement allowed Mendeleev to group elements with similar chemical properties together. 3. **Comparison with Modern Periodic Law**: It's important to note that the modern periodic law, which is based on atomic number rather than atomic mass, was developed later. However, Mendeleev's approach was significant in the development of the periodic table. ...
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