Chapter 7 Periodicity

Question 1

Arrangement of periodic table is based on:

Answer 1

• Atomic number
• Groups
• Periods and periodicity

Question 2

Periodic table arrangement: Atomic number

Answer 2

Reading from left to right: elements are arranged in order of increasing atomic number

Question 3

Periodic table arrangement: Groups

Answer 3

• Vertical columns are groups
• Each element in a group has the same number of outer shell electrons, and therefore similar properties

Question 4

Periodic table arrangement: Periods and periodicity

Answer 4

• Horizontal rows are periods
• Number of period = number of highest energy electron shell in an element’s atoms

Question 5

Periodicity

Answer 5

Repeating trend in properties of the elements across each period

Question 6

Periodicity in electronic configuration: Trend across a period

Answer 6

• Each period starts with an electron in a new highest energy shell