Development of the Periodic Table Flashcards
Who was John Newlands?
arranged elements by increasing atomic mass; created law of octaves
Who was Lothar Meyer?
made connections between atomic mass and element properties
Who was Dimitri Menedeleev?
predicted existence and properties of undiscovered elements
Who was Henry Moseley?
discovered atomic number, arranged by increased atomic number
How do they arrange periodic table now?
increasing atomic number
What are rows 8 and 9?
Lanthanides and Actinides
What are some properties of alkali metals?
soft, reactive, low melting points, and reactivity increases as you go down
What are some properties of alkali metals?
soft, reactive, low melting points, and reactivity increases as you go down
Are halogens reactive?
They are highly reactive
Are noble gasses reactive?
They are unreactive
What are metalloids?
They have physical and chemical properties of both metals and non metals
