The Modern Periodic Table- Unit 3

Why did scientists think the periodic table was a bit of fun at first?

There wasn't much evidence to suggest that the elements really did fit in that way

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What happened after Mendeleev released his work?

Newly discovered elements fitted into the gaps he left so this provided convincing evidence in favour of the periodic table

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Once more evidence was found what happened?

Scientists found that the periodic table could be a useful tool for predicting elements

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In the late 19th century, scientists discovered protons, neutrons and electrons so how did this help discover the periodic table?

The periodic table matches up well to what's been discovered about the structure of atoms- scientists now think it is a useful summary of the structure of atoms

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What is the modern periodic table based on?

Electronic structure

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Using the electronic arrangement what can you predict?

The elements chemical properties

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What are elections in an atom set out in?

Shells- they correspond to an energy level

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Apart from the transition metals, what do elements in the same group have?

The same number of electrons in their highest occupied energy levels (outer shells)

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What is the group number equal to?

The number of electrons in the highest occupied energy level

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What does the positive charge of the nucleus do?

Attracts electrons and holds them in place- the further the electron is from the nucleus, the less the attraction

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When there are a lot of inner electrons, what happens?

The attraction of the nucleus is even less because the inner electrons gets in the way of the nuclear charge which reduces the attraction- known as shielding

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What does the combination of increased distance and increased shielding mean?

An electron in its higher energy level is more easily lost as there's less attraction from the nucleus holding it in place

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What else does increased distance and shielding mean?

A higher energy level is less likely to gain an electron so there's less attraction from the nucleus pulling electrons into the atom

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The Modern Periodic Table- Unit 3

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