1.1 The Early Periodic Table Flashcards Preview

GCSE Chemistry 3.1 The Periodic Table > 1.1 The Early Periodic Table > Flashcards

Flashcards in 1.1 The Early Periodic Table Deck (15)
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1
Q

What did the scientists not knowing about the atoms cause?

A

It caused them to not be able to classify them in a table

2
Q

How did some scientists classify the atoms in the 19th century?

A

Tried to classify them based on their properties and atomic weights

3
Q

Why did scientists use atomic weights of elements to order them instead of the proton numbers?

A

They didn’t know the structure of the element so didn’t know about proton numbers

4
Q

When did Newlands propose his law of octaves?

A

1863

5
Q

What did scientists not know about atoms in the 19th century?

A

They didn’t know the structure of the atoms

6
Q

What was Newlands law of octaves?

A

The law that stated that similar properties are repeated every eighth element

7
Q

How did Newlands order the elements?

A

The 62 known elements at the time were arranged into 7 groups according to their atomic weights

8
Q

After which element did Newlands law not work well?

A

Calcium

9
Q

Why didn’t many people accept Newlands ideas?

A

After calcium, the elements properties didn’t match very well in the groups so other scientists didn’t accept his ideas

10
Q

When did Mendeleev produce a better table?

A

1869

11
Q

How did Mendeleev organise the elements?

A

He left gaps for the undiscovered elements so the groups of the known elements had similar properties

12
Q

What did mendeleevs new table allow him to do?

A

Predict the outcome of the properties of the missing elements

13
Q

What happened when the new elements were discovered?

A

Mendeleevs predictions were confirmed

14
Q

Why did other scientists readily accept mendeleevs ideas?

A

His prediction were proven to be correct when the other elements were discovered

15
Q

Who’s table became the basis for the modern periodic table?

A

Mendeleev