The Periodic Table

Question 1

Who made the periodic table

Answer 1

Dmitri Mendeleev in 1869, Russian

Question 2

Groups

Answer 2

Vertical rows, eight groups numbered using Roman numerals, all elements in the same row have similar chemical properties and the same amount of electrons in the outer shell

Question 3

Group names

Answer 3

I - alkali metals
II - alkaline earth metals
VII - halogens
VIII - noble gases

Question 4

Periods

Answer 4

Horizontal rows, seven rows, first period only has hydrogen and helium, labelled n=1, n=2…

Question 5

Isotopes

Answer 5

Isotopes are atoms of the same element that have a different number of neutrons.
Same atomic numbers but different mass numbers

Question 6

The periodic table

Answer 6

The periodic table is an arrangement of elements in order of increasing atomic number