HW 2 Atomic Structure and Interatomic Bonding

Question 1

Give the electron configuration for Ba^(2+)

Answer 1

1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6)

not supposed to be spaced out .doing it for clarity in reading

Question 2

Problem Solving

Compute the percent ionic character of the interatomic bonds for the following compound: CdS

Equation to be used

Answer 2

14.8%

The percent ionic character is a function of electron negatives of the ions X_A and X_B. Can be found on the elements table.

For CdS, X_Cd=1.7 and X_S=2.5; therefore,

%IC = [ 1- e^((-0.25)(2.5-1.7)^2) ] * 100 = 14.8%

Question 3

What is the difference between atomic mass and atomic weight?

Answer 3

Atomic mass: mass of individual atom
atomic weight: average (weighted) of atomic massess of an atom’s naturally occuring isotopes.

Question 4

What is the electron configuration for an inert gas?

Answer 4

1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(2) 4s^(2)

Question 5

What type(s) of bonding would be expected for brass (a copper-zinc alloy)?

Answer 5

metallic bonding

Question 6

What type(s) of bonding would be expected for rubber?

Answer 6

Covalent bonding with some van der Waals bonding

Question 7

Relative to electrons and electron states, what does the I quantum number specify?

Answer 7

electron subshell

Question 8

Fill in blank

The bonding with electrostatic attraction between oppositely charged ions is called ______.

Answer 8

ionic

Question 9

Fill in blank

The bonding with electron sharing between two adjacent atoms such that each atom assumes a stable electron configuration is called ____.

Answer 9

covalent

Question 10

Fill in blank

The bonding where the positively charged ion cores are shielded from one another, and also “glued” together by the sea of valence electrons is _____.

Answer 10

metallic

Question 11

Materials whose constituent particles are bound by which type of bond are generally expected to have the lowest melting temperatures?

Answer 11

Van der Waals