chemistry 5 quiz #1

Henry Mosely

English physicist determined that the periodic properties lined up better if elements were arranged by atomic number, not mass

s block

Groups 1-2

p block

Groups 13-18

d block

Groups 3-12, transition metals

Dimitri Mendeleev

Organized the periodic table by properties and atomic mass.

lanthanide

The 14 elements with the atomic numbers 58-71.

actinide

The 14 elements with the atomic numbers 90-103.

transition metals

The d-block elements are metals with typical metallic properties.

valence electrons

The electrons available to be lost, gained, or shared in the formation of chemical compounds.

alkali metals

The elements of group 1 of the periodic table.

halogens

The elements of group 17 of the periodic table.

alkaline-earth metals

The elements of group 2 of the periodic table.

main-group elements

The p-block elements together with the s-block elements.

periodic law

The physical and chemical properties of the elements are periodic functions of their atomic numbers.