Periodic Table & Periodic Trends

Chem Unit 4

who is attributed with the idea of arranging the known elements of his time in a table according to their chemical and physical properties

Dimitri Mendeleev

Mendeleev predicted that empty spaces on his periodic table represented…

undiscovered elements

who arranged the periodic table of elements in the order of atomic number

Henry maley

the periodic law says there is a periodic repetition of physical and chemical properties of the elements

when they are arranged in order of increasing atomic number

the vertical columns of the periodic table are called

families

each period in the periodic table corresponds to

energy level

what are valence electrons

electrons that are in outermost level or energy

the horizontal row of the periodic table are called

periods

what do elements in the same periodic group have in common

the same # of valance electrons

what do elements in the same periodic periods have in common

the same # of electron energy levels

how many elements are in a period in which only the s and p sub levels are filled

18

identify the sub levels in a period that contains 32 elements

s,d,f,p

the number of valance electrons in group 17 element is

7

for groups 13-18 the number of valence electrons is equal to

10

for groups two elements which sub level are the valence electrons located in

5

name the three classes of elements

metals, metalloids, nonmetals

Who is attributed with the idea of arranging the known elements of his time in a table according to their chemical and physical properties, noticing that every eighth element shared similar characteristics?

John newlands

Who is attributed with the discovery of several transuranium elements and the reorganization of the periodic table to include the actinide series?

glenn Seaborg

Who is attributed with discovering that the atomic number, rather than atomic mass, is the correct basis for arranging elements in the periodic table?

Henry mosely

what are all the families on the periodic table of elements from left to right

alkali metals, alkaline earth metals, transition metals, boron family, carbon family, nitrogen family, oxygen family, halogens, nobles gases

period 5, group 14

tin

period 3 group 17

chlorine

period 6 group 2

barium

property: lose electrons

metals

property: dull, brittle

nonmetals

property: gain electrons

nonmetals

property: good electrical conductors

metals

property: malleable, ductile

metals

property: are not good conductors

nonmetals

the most reactive group of nonmetals

g17 halogens

this group is unreactive, and only found in pure form in nature

g18 nobles gases

this group name means “basic”

g2 alkaline earth metals

this group of metals contains group 3-12

transition metals

contains the most reactive group of metals

g1 alkali metals

these elements are found in the second row of the f-block elements

artiness

this class of elements have both metallic and nonmetallic properties

metalloids

explain why atomic radius decreases going across the periodic left to the right of the periodic table

the number of protons increase and in return pull the electrons closer to the nucleus

choose the best reason that the atomic radius generally increases moving down a group of elements

the number of occupied energy levels increase

which of the following atoms is largest: nitrogen, phosphorus, and arsenic

arsenic

find phosphorus, sulfur, and chlorine, on the periodic table, which is the largest

phosphorus

write a definition for ionization energy

energy required to move an electron from an atom in the gaseous stage

which from would it take more energy to remove its first electron, sodium or aluminum

aluminum

as u move left to right across a period, the first ionization energy

increases

as u move from the top of a group to the bottom, the first ionization energies

decrease

what is the correct oder of ionization energy

cl>s>al>si>ar

which of these elements have the highest ionization energy? aluminum, silicon, of phosphorus

phosphorus

who is third ionization energy of magnesium much greater that the second ionization energy

because after two electrons have been removes, the atom has a stable noble gas configuration, and removing requires breaking

which of these elements has the highest ionization energy, tin, arsenic, or sulfur

sulfur

what is the general trend of electronegativity as u go down the group on the periodic table

decreases

what element is the most electronegative

flourine

do metals tend to have high or low electronegativities

low

which of the following is smallest: a lithium atom, Li + ion, or a sodium atom

li+ ion

What is the trend for reactivity for the alkali metal group

reactivity increases as u go down the group,