Topic 1 - Development of the Periodic table

Question 1

How were elements arranged before the discovery of subatomic particles?

Answer 1

In order of their atomic mass

Question 2

What was the problem with ordering the periodic table in terms of mass?

Answer 2

Elements ended up being placed in the wrong places.

Question 3

What did Dmitri Mendeleev do with the periodic table?

Answer 3

He switched the order in some cases so the elements with similar properties could be in groups together. Also, he left gaps for elements that had not been discovered yet.

Question 4

What did the discovery of isotopes do for the table?

Answer 4

It showed that Mendeleev was right to not order elements based on their atomic masses.

Question 5

Name 2 physical properties of the metals of the periodic table

Answer 5

Strong, malleable, great conductors, high boiling/melting points.

Question 6

Name 2 physical properties of non metals in the periodic table.

Answer 6

Dull looking, brittle, aren’t always solids at room temp, don’t generally conduct electricity, lower density.

Question 7

Name properties of transition metals which don’t apply to normal metals

Answer 7

Have more than one ion, coloured, make good catalysts, higher boiling points.

Question 8

How do transition metals react with oxygen compared with group 1 elements?

Answer 8

They react more slowly with oxygen.

Question 9

How do transition metals react with water compared with group 1 elements?

Answer 9

They react slowly with water.