1.2.1 And 1.2.2 (The Peridoc Table) (The Development Of The Periodic Table)

Question 1

The peridoic table before the discovery of protons neutrons and electrons

Answer 1

• Arranged in order of atomic weight

Question 2

Problem with early periodic table

Answer 2

• Incomplete
• Elements placed in incorrect order

Question 3

Mendeleev’s periodic table (1869) (2p)

Answer 3

• put the elements in order of atomic mass but left haps in the table because not all the elements had been discovered
• wasn’t afraid to rearrange the order of elements if they didn’t fit the pattern

Question 4

How is the periodic table arranged?

Answer 4

It is arranged we so that elements with similar properties are organised together

Question 5

Similarities of elements in the same group

Answer 5

They have the same amount of electrons in the outer shell

Question 6

Similarities of elements in the same row

Answer 6

They have the same amount of shells