.
They are borderline elements that exhibit both metallic and non metallic properties to some extent
They usually act as electron donors with non-metals and as electron acceptors with metals
Some of these elements are boron, silicon and germanium
They are good conductors of heat and electricity
F < O < C < Be < Li
Li < Be < C < O< F
F < O < C < Be < Li
F < O < Be < C < Li
A
B
C
F
(i), (iii) and (iv)
(ii), (iii) and (iv)
(ii) and (iii)
(ii) and (iv)
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
Be(OH)2
Ba(OH)2
Ca(OH)2
Mg(OH)2
It causes energy to be released
It causes energy to be absorbed
It is expressed in electron volts
It involves formation of an anion
Ne,Ca,Na
H2,N2, O2
Li, Na, K
Na, Br, Ar
1
2
3
4
Atomic number
Atomic volume
Number of valence electrons
Atomic mass
C > B > Be > Li
C > Be > B > Li
B > C > Be > Li
Be > Li > B > C
I-A
IV-A
VII-A
VIII-A
(i) only
(i), (ii) and (iii)
(i), (ii) and (iv)
(iv) only
All the metals are good conductor of electricity
All the metals are good conductor of heat
All the metals form positive ions
All the metals form acidic oxides
D-electrons
F-electrons
P-electrons
S-electrons