1.2 The Periodic Table

Question 1

How did Mendeleev arrange the elements on his periodic table?

Answer 1

.He ordered them in order of atomic mass

Question 2

Why did Mendeleev leave gaps in his periodic table?

Answer 2

.He left gaps so elements that haven’t been discovered yet could be put in

Question 3

How did Mendeleev use his table to predict the existence of elements that have not yet been discovered?

Answer 3

Realised elements with similar properties belonged in similar groups so could predict where some were missing and where they would go once discovered

Question 4

Mendeleev thought he had arranged elements in order of increasing R.A.M, why was this not always true?

Answer 4

He did not know about isotopes so the R.A.M was not always true as the isotopes had not been taken into account.

Question 5

Elements with similar properties are in columns known as what?

Answer 5

Groups

Question 6

Name the two ways elements are arranged in the periodic table

Answer 6

.In order of increasing atomic number in rows called periods

.Elements with similar properties are in columns called groups

Question 7

What reacts to form positive ions?

Answer 7

Metals

Question 8

Where are non metals found on the periodic table?

Answer 8

Towards the top on the right

Question 9

How is the electron configuration of an element related to its position in the periodic table?

Answer 9

.The group an electron is in tells you how many electrons are in its outermost shell