C2.2.9 - Developing the Periodic Table Flashcards

1
Q

What was Mendeleev’s arrangement?

A

It was an attempt to organise elements into a table

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2
Q

What info did Mendeleev consider about the elements

A

The atomic weights of known elements
Knowledge of the chemical reactions of different elements
Knowledge of physical properties, such as melting / boiling points

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3
Q

How did Mendeleev arrange elements in his table?

A

By increasing atomic weight and grouping the elements with similar chemical properties

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4
Q

What did Mendeleev predict?

A

That elements with similar chemical reactions would be discovered, so he left spaces for them in his graph

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5
Q

What was the issue with mendeleev’s table?

A

He did not know about protons and atomic structure

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6
Q

When did Mendeleev die?

A

1907

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7
Q

Who discovered that an atom’s atomic number was the number of protons?

A

Henry Moseley

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8
Q

When did Henry Moseley discover that the amount of protons were equal to an atom’s atomic number?

A

1913

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