chem periodic table

who was Credited with the development of the periodic table

Dmitri Mendeleev

what did Mendeleev's use to arange his periodic table ?

Atomic mass

How Mendeleev arranged the elements in his periodic table

Order of increasing atomic mass

why were there Gaps left by Mendeleev in his periodic table

Elements yet to be discovered

what Additional information included by Mendeleev in his periodic table

Properties of the elements

How Mendeleev predicted the properties of missing elements

Trends and patterns

who is Credited with the modern periodic table

Henry Moseley

Basis for the modern periodic table

Atomic number

How the modern periodic table is arranged

Order of increasing atomic number

What the modern periodic table resolved based on atomic mass

Resolving anomalies

Number of periods in the modern periodic table

7 periods

Number of groups in the modern periodic table

8 groups

Elements in group 1 of the periodic table

Alkali metals

Elements in group 7 of the periodic table

Halogens

Elements in group 0 of the periodic table

Noble gases

what is in between group 2 and 3

transition metals

what is special about the ions transition metals form

they can sometimes form 2 or 3 difernt isotopes e.g. Fe 2+ OF Fe 3+