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Who discovered the periodic table?
Mendeleev
Who established atomic numbers as the basis for organizing the periodic table?
Mosely
What's the periodic law?
(when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties). Or (The physical and chemical properties of the elements are periodic functions of their atomic numbers).
What are the 3 sets of elements that have been added to the periodic table since Mendeleev's time?
Noble gases, Lanthanides, and Actinides
The columns in the periodic table are referred to be what?
Groups
What's the definition of the periodic table?
Is the arrangement of elements in order of their atomic number.
What is the atomic mass?
Number of protons and neutrons
What is the atomic number?
number of protons
The Lanthanides belong to which period?
Period 6
why noble gases are unreactive?
Because their octet is complete.
Moseley's periodic table was organized by increasing atomic number?
True
Mendeleev's periodic table has periods and groups?
No, only periods
Mendeleev arranged the elements in vertical periods according to what?
According to relative atomic mass.
Niels Bohr
Aufbau principle- electrons fill the lowest energy level orbitals first.
Sir William Ramsay
discovery of the noble gases argon, neon, krypton and xenon formed an entirely new group in the periodic table.
Wolfgang Pauli
no two electrons in the same atom can have identical values for all four of their quantum numbers.
Erwin Schrodinger
an equation that predicts both the allowed energies of a system as well as address the wave-particle duality.
Friedrich Hund
every orbital in a sublevel must be singly occupied before it can be doubly occupied, and that all electrons in singly occupied orbitals must have the same spin.
Henry Mosely
the atomic number is the number of positive charges in the atomic nucleus, leading to the revisement of the periodic table.
Note
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