Question: Is B2 2- a Paramagnetic or Diamagnetic ?
Answer: B2 2- is a Diamagnetic

Is B2 2- a Paramagnetic or Diamagnetic ?
What is Paramagnetic and Diamagnetic ?
Paramagnetic
Paramagnetic or Diamagnetic
Paramagnetism is a form of magnetism whereby certain materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field.
https://en.wikipedia.org/wiki/Paramagnetism

Diamagnetic
Paramagnetic or Diamagnetic
Diamagnetic materials are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted by a magnetic field.
https://en.wikipedia.org/wiki/Diamagnetism

Ferromagnetism
Ferromagnetism
Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
https://en.wikipedia.org/wiki/Ferromagnetism

Paramagnetic List
calcium ( ca )
O2 ( Oxygen )
Li2
B2
Zirconium ( ZR )
aluminum (Al)
Co2
f2
NF 
fe3+
Cs ( CESIUM )
Manganese ( mn )
Mn2+
Fe2+
Tin ( Sn )
vanadium
N2 (2-)
C2 2+ 
Strontium
K ( Potassium )
na
mg ( Magnesium ) 
o
al3
ti2
cu2
Cl
Titanium ( ti )

Diamagnetic List
C2
Ne2
CO
silicon ( si )
sulfur ( s )
neon ( Ne )
h2 ( hydrogen )
zinc ( zn )
helium ( he )
beryllium ( be )
Nitrogen ( N )
Nitrogen gas ( N2 )
be2
carbon ( c )
s2
ag
Copper ( cu )
zn2+
V3+
Cadmium ion ( cd2+ )
B2 2-
no
CN-
au ( gold )
P
br
Boron ( b )
Arsenic
se ( Selenium )
Argon ( ar )
kr ( Krypton )
Phosphorus

Ferromagnetic
Nickel ( ni )
Ni2+
Cobalt
Iron ( fe )

Antiferromagnetic
Chromium ( cr )

We get answers from
Resources
www.quora.com
answers.yahoo.com
answers.com
www.quia.com
quizlet.com
www.reference.com
socratic.org
https://en.wikipedia.org
https://en.wikipedia.org/wiki/Diamagnetism
https://en.wikipedia.org/wiki/Ferromagnetism
https://en.wikipedia.org/wiki/Paramagnetism
pubchem.ncbi.nlm.nih.gov
www.periodictable.com/Properties/A/MagneticType.html

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Question: Is B2 2- a Paramagnetic or Diamagnetic ?
Answer: B2 2- is a Diamagnetic