10/19/09

Test Tomorrow

• 43 questions
• 6 calculations the rest are conceptual questions
• 100% Scantron
• know the vocab
• know all the scientists and their experiments

Sample Problems from class (there is no option for super and subscript so I will separate with commas)

Ge- 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d9; [Ar]4s2,3d10,4p2

Mn- 1s2,2s2,2p6,3s2,3p6,4s2,3d5;[Ar]4s2,3d5

Ag- 1s2,2s2,2s6,3s2,3p6,4s2,3d10,4p2;[Kr]4d10,5s1

K- 1s2,2s2,2p6,3s2,3p6,4s1;[Ar]4s1

B- 1s2,2s2,2p1;[He]2s2,2p1

Ca2+ --> 1s2,2s2,2p6,3s2,3p6

Br- ----> 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6

C4- -----> 1s2,2s2,2p6

Cu2+ ----> 1s2,2s2,2p6,3s2,3p6,4s0,3d10

Al3+ -----> 1s2,2s2,2p6

K ---> n=4; l=0; m=0; s=+1/2

Cu2+ ---> n=4; l=2; m=+1; s=-1/2

Mendeleev and Chemical Periodicity

Mendeleev noticed that when the elements are arranged in order of increasing atomic mass, certain similarities in chemical properties appeared at regular intervals

repeating patterns referred to as PERIODIC

Mendeleev created a table in which elements with similar properties were grouped together----> a periodic table (or chart) of elements

After Mendeleev placed all the known elements in the table there were several empty spaces

1871--> Mendeleev predicted the existence and properties of elements that would fill in 3 of the empty spaces

by 1886---> all 3 of those elements were discovered

Moseley and Periodic Law

In 1911, English scientist Henry Moseley discovered that elements fit into patterns better when they are arranged according to atomic #

Periodic Law-->states that physical and chemical properties of elements are periodic functions of the atomic #s