The modern periodic law is a restatement of Mendeleev's periodic law and it state that elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical properties.
Elements on the periodic table appear together in regions based on the energy sub-level that contains their outermost valence electrons. What are these regions called blocks. The blocks in the periodic table are;
The modern periodic law is a restatement of Mendeleev's periodic law and it state that elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties.
The group of elements that are non reactive are the noble gases. Hence, the group of elements that Ramsey discovered are the noble gases. Elements that do not occur naturally are called man made elements. An example of a man made element is technetium.
The elements in the periodic table are arranged in groups and periods. The group of the periodic table that contains the elements radium, strontium, and magnesium is the alkaline earth metals.
For all elements the atomic number of the element serves as an identity of the element and indicates the number of protons present in an atom of the element.
It is a false statement that an atom of oxygen contains 8 protons, 8 electrons, and 16 neutrons. Electronegativity generally increases as atomic radius decreases within a period.
Among argon, fluorine, helium and plutonium, argon posses the greatest number of valence electrons. There should be four dots drawn around the symbol, C, to create the Lewis dot structure for a carbon atom.
The statement that "to achieve an octet in the valence energy level, a nitrogen atom will lose five electrons" is false. It is also a false statement that; "to achieve an octet in the valence energy level, a sulfur atom will become a cation."
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