Democritus is an ancient Greek philosopher who proposed the concept of indivisible particles called atoms, but he did not contribute to the construction of the periodic table. The other options all played a significant role in the development of the periodic table.
3582
How many standard elements are found in the seventh period of the periodic table?
The seventh period of the periodic table accommodates 2 normal elements, which are francium (Fr) and radium (Ra). These elements are located at the far left and right ends of the period.
3583
What is the correct order of atom sizes based on atomic radius?
The atomic radius increases down a group in the periodic table, so barium (Ba) has a larger atomic radius than magnesium (Mg). This order is correct because the size of atoms generally increases as you move down a group in the periodic table.
3584
In Periods from Left to right Electronegativity will: _________?
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3585
Modern periodic table has been divided in ___________ blocks?
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3586
Which one of the following is not a periodic property ?
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3587
Which pair of elements exhibits a diagonal relationship in the periodic table?
Diagonal relationship in the periodic table occurs between elements that are diagonally adjacent. Lithium and magnesium exhibit similar properties due to similar ionic size and electronegativity, making them a classic example of diagonal relationship.
3588
Which of the elements do not fall in stair case of the modern periodic table__________________?
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3589
What led to a revision of Mendeleev's periodic law?
Moseley's discovery of atomic numbers led to a revision of Mendeleev's periodic law. Mendeleev's law was based on atomic weights, but Moseley's work showed that elements should be arranged by atomic number, not weight. This changed the understanding of the periodic table's structure.
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