C4 Periodic Table

Question 1

Describe how Mendeleev arranged the elements.

Answer 1

● He ordered his table in order of atomic mass, but not always strictly
● Left gaps for elements that he thought had not been discovered yet

Question 2

How did Mendeleev use his table to predict the existence and
properties of some elements not then discovered?

Answer 2

● Mendelev realised elements with similar properties belonged in the same groups
in the periodic table so was able to leave gaps and place the discovered
elements where they fit best

Question 3

Explain that Mendeleev thought he had arranged elements in order of
increasing relative atomic mass but this was not always true because of the
isotopes.

Answer 3

Some elements have a higher mass than others when isotopes are taken into account.

Question 4

Explain the meaning of atomic number of an element in terms of
position in the periodic table.

Answer 4

• Elements are arranged in order of atomic number
• Elements in the same group have the same amount of electrons in the outer shell.

Question 5

periods account for…

Answer 5

Atomic number

Question 6

Groups account for…

Answer 6

similar properties

Question 7

Identify elements as metals or non-metals according to their position in
the periodic table.

Answer 7

o Majority of elements are metals.
o Found to the left and towards the bottom of the periodic table., because
they lose electron(s)

o Found towards the right and top of the periodic table, because they gain
electron(s)

Question 8

Explain how the electronic configuration of an element is related to its
position in the periodic table.

Answer 8

the group an electron is in tells you how many electrons are in its outermost
shell aka group 1 elements have 1 electron in their outer shell.