C2.2.10 - Atomic structure and the Periodic Table

Question 1

What group was discovered in 1894 that even Mendeleev didn’t predict its existence?

Answer 1

Group 0

Question 2

What are the patterns of chemical properties in the Periodic Table?

Answer 2

• Elements are arranged in order of increasing atomic number
• The atomic number is the number of protons in an atom
• The number of electrons in an atom is equal to the number of protons
• Electronic structure is determined by the number of electrons
• The electronic structure of an element determines its chemical properties

Question 3

What happens to the reactivity in Group 1 and 2 as you go down the group?

Answer 3

The reactivity increases

Question 4

What happens to the reactivity of Group 7 as you go down the group?

Answer 4

It decreases