Periodic Table

Question 1

How did Mendeleev arrange elements in his version of the periodic table?

Answer 1

Ordered them according to their atomic mass
left gaps for other elements to be found later
made mistakes
Didn’t include group 0 (Nobel gases)

Question 2

What’s the differences between the modern periodic table and the Mendeleev table

Answer 2

We order them according to atomic number instead of mass

Question 3

Predict the electron configuration of the first 20 elements and explain why

Answer 3

1-1, 2-2, 3-2.1, etc. as they are ordered according to atomic number we know how many electrons there are in each of them

Question 4

Describe groups and periods

Answer 4

Group: electrons on the outside shells
Period: number of shells