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History of the Periodic Table Flashcards | StudBud
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History of the Periodic Table
History of the Periodic Table
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AQA TRILOGY CHEMISTRY 5.1.2.2
Flashcards
8 cards
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Questions
8
Answers
1
When Mendeleev left gaps, it enabled him to make a prediction, he then gained _?_ to prove this
Elements
Theory
Hypothesis
Evidence
2
How did leaving gaps improve Mendeleev's periodic table?
It separated out the metals and non-metals
He could predict the properties of undiscovered elements
It mean't that the order of atomic mass was not followed
Newly discovered elements would fit the pattern of the group
3
Elements in early periodic tables were arranged in order of their....
properties
Atomic mass
Atomic Number
Number of neutrons
4
Elements on the modern periodic table are arranged in order of their.....
Properties
Atomic Number
Number of neutrons
Atomic Mass
5
Arranging elements in order of atomic mass was flawed, what discovery proved this?
neutrons
new elements
Isotopes
the electron
6
The atomic mass is equal to...
electrons + protons + neutrons
protons + electrons
neutrons + electrons
protons + neutrons
7
What was the main issue with early periodic tables?
They grouped elements based on their properties
They grouped elements by their atomic numbers
Many elements were undiscovered
Elements were placed in inappropriate groups
8
In early periodic tables elements were in inappropriate groups, how did Mendeleev fix this?
He left gaps for undiscovered elements
He included isotopes.
He arranged the elements by atomic number
He grouped the elements by properties
