C4 Positions In The Periodic Table

Question 1

What does the group number tell us?

Answer 1

Electron amount in outer shelf.

Question 2

What does the period number tell us?

Answer 2

Amount of electron shelves.

Question 3

Mendeleev

Answer 3

• Mendeleev arranged his elements in order of atomic mass.
• This sometimes lead unusual placing of one or two elements because there are isotopes of different element which might distort the mass number, for example Iodine and Trillium.
• Now we organise our table by atomic number.
• This resolved all Mendeleevs issues.

Question 4

Modern periodic table

Answer 4

• Elements are arranged in order of increasing atomic number, in rows called periods.
• Elements with similar properties are placed in the same vertical columns called groups.

Question 5

Metals

Answer 5

Because the periodic table groups together elements with similar properties, all the metals are found on the left of the table and the non-metals on the right. Most elements are non-metals.