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