topic 4- periodic table

Question 1

What are the horizontal rows called?

Answer 1

Periods

Question 2

What are the vertical rows called?

Answer 2

Groups

Question 3

Metals are found on which side of the periodic table?

Answer 3

The left

Question 4

Non-metals are found on which side of the periodic table?

Answer 4

The right

Question 5

How was Mendeleev’s periodic table arranged?

Answer 5

In order of Relative Atomic Mass

Question 6

How is the modern period table arranged?

Answer 6

By increasing atomic number

Question 7

what was useful about Mendeleev’s periodic table when scientists later discovered new elements?

Answer 7

he had left gaps for undiscovered elements

Question 8

Explain the importance of Mendeleev leaving gaps in his periodic table:

Answer 8

The gaps were for elements not discovered then. Mendeleev used his table to predict the properties of these elements. When they were discovered later, their properties closely matched his predicted properties. This supported the ideas behind his table.

Question 9

Describe how Mendeleev arranged the elements known to him ( 2 marks ):

Answer 9

In order of increasing atomic mass, taking into account the properties of the elements and their compounds

Question 10

Suggest one reason why other scientists at the time thought that Mendeleev’s table was not correct ( 1 mark ):

Answer 10

It had gaps