chemistry pd table and trends

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

dmitri mendeleev

dmitri mandaleev predicted that the empty spaces on his periodic table represented

undiscovered elements

who arranged the periodic table in order of atomic number

henry Moseley

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

when arranged by increasing atomic number.

vertical columns

groups

each period corresponds to

an energy level

valence electrons

the electrons in a atoms outermost shell that are involved in forming chemical bonds

rows

periods

what do elements in the same periodic group have in common

same number of valence electrons

what do elements of the same periodic period have in common

same number of electron shells or energy levels

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

8

sublevels in a period that contains 32 elements

s,p,d,f

the number of valence electrons in group 17 elements

7

for group 2 elements which sublevels are the valence electrons located in

outermost shell

group 18

unreactive and found In pure form in nature

most reactive

group 1

second row of f block elements

actinides

both metallic and nonmetallic properties

metaloids

why does atomic radius decrease going across the period left to right

the number of protons in the nucleus increases resulting in a stronger positive charge that pulls the electron cloud closer to the nucleus.

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

the number of occupied energy lev

nitrogen,phosphorus,arsenic. Largest?

arsenic

phosphorus,sulfur,chlorine. Largest?

phosphorus

nitrogen,oxygen,fluorine. Smallest?

fluorine

iozation energy

the minimum energy required to remove an electron from gaseous atom or ion

which would take more energy to remove its first electron, sodium/aluminum

aluminum

when you move right across a period ionization energy

increases

when you move from the top of a group to the bottom, the 1st ionization energy

decreases

correct order of ionization energy

cl>s>p>si>al

highest ionization energy of aluminum,silicon,phosphorus

phosphorus

why is the 3rd ionization energy of magnesium so much greater than the second ionization energy

removed from a lower more stable energy level

tin,arsenic,sulfur. Highest iozation energy?

sulfer

what is the general trend of electronegitivity as you go down the group on the periodic table

decreases

what element is the most electronegitive

fluorine

do metals tend to have high or low electronegativities

low

what is the trend for reactivity for the alkali metal group

increases as you move down the group

what trend for reactivity for the halogens group

decreases as you go down the group