What is the fundamental difference between Mendeleev's periodic law and the modern periodic law?
How are elements classified in the periodic table based on their electronic configuration?
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Which group of elements in the periodic table includes metals, non-metals, and metalloids?
The general electronic configuration of d-block elements is:
Which element, temporarily named ununseptium, belongs to group 17 in the periodic table?
Which periodic property is defined as the ability of an atom to attract a shared pair of electrons towards itself?
How does the metallic character of elements change as you move along a period in the periodic table?
Which trend correctly describes the valency of elements with respect to hydrogen across a period?
How does the basic nature of oxides change along a group in the periodic table?
What happens to the reducing character of elements as you move along a period in the periodic table?
What is the most abundant element in the universe by mass?
Which type of water does not form lather with soap due to the presence of calcium or magnesium compounds?
What is the rare and radioactive isotope of hydrogen with a mass number of 3 and a half-life of 12.4 years?
Which form of hydrogen is more reactive than molecular hydrogen and appears suddenly during a chemical reaction?
What is the colorless, odorless, and tasteless liquid with a higher density than ordinary water due to the presence of deuterium?