Section 4: periodic table

Question 1

What is a group?

Answer 1

Elements in the same vertical column are in the same group. Elements in the same group have the same number of electrons in their outer shell, and therefore similar properties.

Question 2

What is a period?

Answer 2

Elements in the same horizontal row. The atomic number increases by one moving across the period from left to right.

Question 3

What is a metal?

Answer 3

Elements that react to form positive ions (except Hydrogen). Left and centre of periodic table.

Question 4

Non - metal

Answer 4

Elements that react to form negative ions. Right side of the periodic table.

Question 5

What could Mendeleev do?

Answer 5

Was able to make s relatively accurate periodic table by leaving gaps for undiscovered elements and re-arranging some elements (Mendeleev could only measure relative atomic mass, not atomic number). Hence he arranged the elements in order of mass number and predicted the properties of the elements in the gaps.