History of the periodic table-5.1

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19 Terms

1
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Who discovered the periodic table?

Mendeleev

2
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Who established atomic numbers as the basis for organizing the periodic table?

Mosely

3
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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).

4
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What are the 3 sets of elements that have been added to the periodic table since Mendeleev's time?

Noble gases, Lanthanides, and Actinides

5
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The columns in the periodic table are referred to be what?

Groups

6
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What's the definition of the periodic table?

Is the arrangement of elements in order of their atomic number.

7
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What is the atomic mass?

Number of protons and neutrons

8
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What is the atomic number?

number of protons

9
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The Lanthanides belong to which period?

Period 6

10
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why noble gases are unreactive?

Because their octet is complete.

11
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Moseley's periodic table was organized by increasing atomic number?

True

12
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Mendeleev's periodic table has periods and groups?

No, only periods

13
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Mendeleev arranged the elements in vertical periods according to what?

According to relative atomic mass.

14
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Niels Bohr

Aufbau principle- electrons fill the lowest energy level orbitals first.

15
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Sir William Ramsay

discovery of the noble gases argon, neon, krypton and xenon formed an entirely new group in the periodic table.

16
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Wolfgang Pauli

no two electrons in the same atom can have identical values for all four of their quantum numbers.

17
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Erwin Schrodinger

an equation that predicts both the allowed energies of a system as well as address the wave-particle duality.

18
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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.

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Henry Mosely

the atomic number is the number of positive charges in the atomic nucleus, leading to the revisement of the periodic table.