Chapter 4 Flashcards
What did John Newlands do that was significant?
Created law of octaves, organized elements according to their properties and in order of increasing mass, first to detect a periodic pattern.
Who is John Newlands?
Chemist who noticed a periodic pattern
How did Newlands organize the elements?
According to their properties and increasing mass
Who created the Law of Octaves?
John Newlands
What is the Law of octaves?
Elements according to increasing atomic weight, every 7 elements have similar physical and chemical properties
What is wrong with the Law of Ocatves?
Some elements don’t fit in and there are gaps.
Who is Dmitri Mendeleev?
Russian Chemist
What did Dmitri Mendeleev create?
First periodic table
How many elements has been created during 1869?
63
Dmitri Mendeleev wrote what on each card?
Symbol, physical and chemical properties, atomic mass
How did Dmitri Mendeleev organize elements?
Increasing atomic number
What were 2 observations that Dmitri Mendeleev had?
Elements don’t always fit neatly in orders of atomic mass and noticed gaps should be filled
Who is Henry Moseley?
Discovered atomic number
What major term did Henry Moseley create?
Atomic number
How did Moseley organize elements?
Atomic number
What’s the Periodic Law?
States that when the elements are arranged according to their atomic number, elements with similar properties appear at regular intervals
On earth and space where can you find elements?
Atmosphere and inside the earths crust
How is the periodic table organized today?
Atomic number
The number in the upper corner is what?
Atomic number
What numbers below the symbol represent?
Atomic mass
The letter is what?
Symbol
The word “gas” in the corner would represent what?
It’s state
The main things that every periodic table will have are what?
Symbol, atomic number, atomic mass, and name
What’s the atomic number?
Amount of protons and electrons an element has
