Periodic Trends
valence electron
Electrons in the outermost shell
as you move down a group, atomic size increases because
an energy level is added
when an atom gains an electron, it becomes negatively charged (more electrons than protons)
anion -
what group is less reactive than group 1 elements
group 2
which group has the most reactive metals
group 3 (alkali metals)
elements with similar properties are found in ..
groups
in which family are all the elements chemically unreactive
7 (noble gases)
only nonmetal in group 1
H
group 6
Halogens
group 1
activides
group 3
alkali metals
lowest ionization energy
alkali metals
which group has the largest size
alkali metals
which groups on periodic table are most reactive
alkali metals
group 4
alkaline earth metals
magnesium has a larger size then aluminum because
aluminum's nucleus is stronger
why do elements in the same family have similar chemical properties
because their electron arrangement
nonmetal atoms can gain electrons, metal atoms can lose electrons becoming..
cations +
which orbital block corresponds to the transition metals i the periodic table
d orbital
which is smaller fluorine or chlorine ?
fluorine is smaller
how are the elements in the modern periodic table arranged
increasing atomic number
what general trend exists for ionization down a family
ionization energy decreases
which general trend exists for ionization energy across a period
ionization enrgy increases
group 2
lanthonides
anions are always... than the original atom
larger
metals tend to ..
lose electrons
who is the russian chemist who proposed the first periodic table based on physical and chemical properties
mendeleev
metalloids have properties of
metals and nonmetals
group 7
noble gases
which group has highest ionization energy
noble gases
which group has the smallest size
noble gases
what are elements that do not conduct electricity
non metals
an element with the configuration 1s²2s²2p⁵ is a ..
nonmetal
PEL
principal energy level
what general trend exists for atomic size across a period
size of the atom decreases
what general trend exists for atomic size down a family
size of the atom increases
cations are always...than the original atom
smaller
an element in group 15 has an outer shell configuration of ..
s²p³
electron affinity
the energy change that occurs when an atom gains an electron
periodic law
the repetition of similar properties at regular intervals when elements are arranged by increasing atomic number
the octet rule is based on
the stability of an atom with eight electrons in its outer energy level
where are non metals found
to the right of the periodic table
group 5
transition elements
what do k and Br have in common
valence electron are found in fourth energy level