Periodic Table (7.1)

Question 1

Who created the first modern periodic table?

Answer 1

Dmitri Mendeleev

Question 2

What did Mendeleev do with some spaces on the periodic table?

Answer 2

He left gaps.

Question 3

How are elements arranged into periods?

Answer 3

Horizontally by increasing atomic (proton) number

Question 4

How are groups arranged?

Answer 4

Vertically by the number of electrons on the outer shell of an atom

Question 5

What are the periodicity in properties (characteristic trends across a period)

Answer 5

-Electron configuration
-Ionisation energy
-Structure
-Melting points

Question 6

What’s the general rule about electron configuration across a period?

Answer 6

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

Question 7

What’s the electron configuration trend for Period 2?

Answer 7

The 2s subshell fills with 2 electrons, followed by the 2p subshell with 6 electrons

Question 8

What’s the electron configuration trend for Period 3?

Answer 8

The 3s subshell fills with 2 electrons, followed by the 3p subshell with 6 electrons

Question 9

What’s different about Period 4?

Answer 9

Across Period 4, while the 3d subshell is involved, only 4s and 4p sub-shells are occupied.

Question 10

What happens to ionisation energy down a group?

Answer 10

Ionisation energy decreases