Development & Anatomy of the Periodic Table

Question 1

How did Meyer & Mendeleev organize the Periodic Table?

Answer 1

1. Organized it by increasing atomic mass.
2. Organized it by shared characteristics between the elements.
3. Left space for other, non-discovered elements.

Question 2

Why did Mosley rearrange the Periodic Table?

Answer 2

Mosley realized elements were not properly sorted by increasing atomic mass.
Noticed each element had a distinct number of P+, so he ordered them by atomic number.

Question 3

What is the Periodic Law?

Answer 3

When elements are arranged in order of increasing atomic number, there is a periodic repetition of the elements.

Question 4

Periodic groups:

Answer 4

• Group 1; Alkali Metals: Soft metals, Highly Reactive, One Valence Electron
• Group 2; Alkali Earth Metals: Reactive, Two VE
• Group 3; Boron Family: Three VE
• Group 4; Carbon Family: Metals, Nonmetals, Metalloids, Four VE
• Group 5; Nitrogen Family: Metals, Nonmetals, Metalloids, 5 VE
• Group 6; Oxygen Family: Nonmetals & Metalloids, 6 VE
• Group 7; Halogens: Most reactive Nonmetals, 7 VE
• Group 8; Noble Gasses: Nonmetals, Non-reactive, 8 VE (Except He)

Question 5

Organize the 3 types of Elements

Answer 5

1. Metals: Shiny, Mailable, Conductive, Solid at Room Temp (Excluding Mercury)
2. Nonmetals: Dull, Brittle, Non-conductive, Gas/Liquid/Solid
3. Metalloids: Combination of Metal & Nonmetal Characteristics, Semi-conductive