The first alkaline earth metal is ………….
a) Be
b) Sr
c) Mg
d) Ca
The third halogen is …………..
a) F
b) Cl
c) Br
d) I
The second actinide metal is …………..
a) Fe
b) Sr
c) Cu
d) Pa
Noble gases are………..
a) He
b) Ar
c) Ne
d) all of these
Halogen element is……………..
a) F
b) Br
c) Cl
d) all of these
Hydrogen is…………..
a) lightest
b) explosive gas
c) most abundant
d) all of these
