SC4b Atomic Number and the Periodic Table

Question 1

group?

Answer 1

column in the periodic table

Question 2

period?

Answer 2

row in the periodic table

Question 3

how are elements sorted in a period?

Answer 3

order of atomic number

Question 4

how are elements sorted in a group?

Answer 4

elements with similar properties

Question 5

Mendeleev put elements in order of increasing atomic mass but the modern periodic table is in order of atomic number why?

Answer 5

information found later:
~more information about atomic structure
~greater number of elements, which might make spotting the patterns and arranging the table easier
~more knowledge about the properties of the elements

Question 6

ESQ - give an example, other than iodine and tellurium, of a pair of elements that would be in the wrong place if ordered by relative atomic mass. (1 mark)
suggest why ordering by relative atomic mass would be incorrect. (1 mark)

Answer 6

argon and potassium

they would be in the wrong groups/they would be in the wrong period/they would not be with similar elements