Modern Periodic Table

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When the Periodic Table was first released, why did Scientists think it was not important?
There wasn't much evidence to suggest that the elements fit together in that way.
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What was a convincing evidence in favour of the Periodic Table?
Newly discovered elements fitted into the gaps of Mendeleev's work
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What was the Peiodic Table useful for?
Predicting properties of elements and summarised the structure of atoms
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What was discovered in the 19th century ?
P, N, E and the Periodic Table matches up well to what's been discovered about the structure of the atom
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When E, P, N were discovered, how was the Periodic Table arranged?
In order of atomic number, arranged by their electronic structure.
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What does the electron arrangement allow you to do?
Predict element's chemical properties
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How where E in an atom set out?
Shells
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What did shells correspond to?
Energy level
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What do the elements in the same group have?
Same no. of E in their highest occupied energy level (outer shell)
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What is the group no. equal to?
The no. of E in the highest occupied shell
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How are E held into place?
The positive charge of the nucleus attracts the negative charge of E.
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What decreases the attraction of the nucleus?
If E is far away from the Nucleus. If there are lot of inner E.
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What is the effect known as shielding?
When Inner E 'get in the way' of the nucleus charge reducing the attraction
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How is an E in a higher energy level more easily lost?
Because of the increased distance and shielding, there's less attraction from the nucleus holding it into place.
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How is a higher energy level less likely to gain an E?
Increased distance and shielding , means there is less attraction from the Nucleus pulling E into the atom
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Other cards in this set

Card 2

Front

What was a convincing evidence in favour of the Periodic Table?

Back

Newly discovered elements fitted into the gaps of Mendeleev's work

Card 3

Front

What was the Peiodic Table useful for?

Back

Preview of the front of card 3

Card 4

Front

What was discovered in the 19th century ?

Back

Preview of the front of card 4

Card 5

Front

When E, P, N were discovered, how was the Periodic Table arranged?

Back

Preview of the front of card 5
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