Physical science 13.4 review
elements with atomic numbers 89-103
Actinium
group 2 elements that all have 2 val. electrons, are harder, denser and less reactive than alkali metals .
Alkaline earth metals
the two elements _______ and ________ do not follow the octet rule. they tend to have 2 valence electrons
hydrogen helium
metals shown in periods beneath the main body of periodic table but fit between groups 3 and 4.
innertransition
elements with atomic numbers 57-71
lanthanoids
_______also called RepresentativeElements, include groups 1,2, and 13-18, are most commonly involved in chemical reactions
main group elements
elements, which are hard, dense, shiny solids and are good conductors of heat and electricity, with high melting points
metals
_______ _______ elements include groups 13-16 and exhibit a wider variety of properties than other groups .
mixed group
elements in group 17, their name means ' salt formers' they easily combine with alkali and alkaline earth metals to form salt
nalogens
elements in group 18, they contain 8 val.electrons and rarely combine with other elements
noble gases
group of elements that are found in nature in their pure states; no natural compounds of these gases exist
noble gases
elements which are poor conductors of electricity and heat.
nonmetals
According to the _________... most atoms tend react to obtain eight electrons their valence shell
octet rule
the_______ states that elements show regular and repeating properties when they are arranged by their increasing atomic number.
periodic law
elements in group 15
phictogens
also called metalloid- solids that have properties intermediate between metals and nonmetals.
semimetals
elements included in groups 3 to 12, all these have either 1 or 2 valence electrons
transition metals
electrons in the outermost shell are called...
valence electrons
elements in the same group have the same number of __________ __________
valence electrons
the outer shell of an electron cloud is called the ...
valence shell
group 1 elements that are very soft, shiny, and have a low melting points.
alali metals
the periodic table of elements is arranged by _________ and the number of valence electrons
atomic number
each elements _____ provides information including element name, symbol, atomic number, & average atomic mass.
box
a basic constitute of all living things and the second most abundant element in the human body.
carbon
period
each row on the periodic table is called a_________
elements of the same period have the same number of....
electron shells
Chalcogens
elements in group 16
each column on the periodic table is called a ______
group
