Chapter 2

Question 1

electron weight?

Answer 1

9.11X10^-31 kg

Question 2

proton and neutron weight?

Answer 2

1.67X10^-27kg

Question 3

atomic number (z)

Answer 3

of electrons of neutral species

of protons in nucleus of atom

Question 4

isoptopes

Answer 4

elements with same # of protons, but different # of neutrons

Question 5

atomic mass (A)

Answer 5

sum of masses of proton and neutron

Question 6

atomic mass unit (amu)

Answer 6

1/12 mass of 12C

Question 7

atomic weight

Answer 7

wt of 6.023X10^23 molecules or atoms.

1amu/atoms=1g/mol

Question 8

electrons have _____ and _____ properties

this means that electrons are in _______ defined by a probability (Bohr atomic model)
each orbital at discrete energy level determined by __________

Answer 8

wavelike and particulate

orbitals
quantum numbers

Question 9

what do the following stand for?

n=?
l=?
ml=?
ms=?

Answer 9

n=principle (energy level-shell) K,L,M,N,O (1,2,3, etc)

l=subsidiary (orbital)
s,p,d, f (0,1,2,3,…,n-1)

ml=magnetic
1,3,5,7 (-l to +l)

ms=spin
1/2,+1/2

Question 10

electrons have discrete ________

Answer 10

energy states

Question 11

_____ - those in unfilled shells

Answer 11

valence electrons

Question 12

valence electrons determine all of the following properties

Answer 12

chemical, electrical thermal, optical

Question 13

columns: similar ________ structure

Answer 13

valence

Question 14

ionic bond= ________+nonmetal

Answer 14

metal+nonmetal

Question 15

occurs between + and - ions. Requires _________-

Answer 15

electron transfer

Question 16

similar _______: share electrons

Answer 16

electronegativity

Question 17

metallic bond

Answer 17

delocalized as electron cloud

Question 18

secondary bonding arises from interactions between __________

Answer 18

dipoles

Question 19

energy balance of _______ and ______ terms

Answer 19

attractive and repulsive