The Periodic Table /

Question 1

Mendeleev’s table

Answer 1

• Left gaps for unknown elements - was able to predict properties of those elements
• No noble gases
• Ordered by atomic mass

Question 2

Modern periodic table

Answer 2

• Ordered by atomic number
• Noble gases
• Groups - shows us the electron configuration

Question 3

Electron configuration

Answer 3

Number of shells = period

How many electrons in the outer shell = group

Question 4

Atomic number

Answer 4

Number of protons

Question 5

Atomic mass

Answer 5

Number of protons and neutrons