The periodic table

Question 1

How did Mendeleev sort the elements in his periodic table

Answer 1

He sorted them into groups (columns) based on their properties.

Question 2

What order did Mendeleev put the elements in his periodic table into

Answer 2

He put them in order of atomic mass and noticed that they would be in columns of similar properties

Question 3

How did some elements not fit into Mendeleev’s order

Answer 3

Some elements would not be in columns of similar properties

This is because he didn’t take into account the relative abundance of the element’s isotopes

Question 4

How do we order elements in the periodic table today

Answer 4

In ascending atomic number

Question 5

What are the periods in the periodic table

Answer 5

The rows

How many shells are around the nucleus

Question 6

What are the groups in the periodic table

Answer 6

The columns
Similar chemical properties
How many electrons in the outer shell

Question 7

What do you noble gases (group 0)have that other elements don’t

Answer 7

Full outer shells

Question 8

What are some properties of metals

Answer 8

Form positive ions
Conductors 
high melting/boiling points 
ductile 
malleable

Question 9

What are some properties of nonmetals

Answer 9

Form negative ions
insulators
low melting/boiling points

Question 10

How did Mendeleev use his table to predict the existence and properties of some elements not yet discovered

Answer 10

He left gaps where elements did not fit
The groups they were in determined their properties
Elements were later found to fit in these gaps