Valence electrons Bonds Radioactive What group is it in? When was it found?
100
He
8
100
Ca +O
CaO
100
Is Einsteinium radioactive
True
100
Li
Alkali metals
100
Ta
1802
200
Ti
4
200
Mn+Au
MnAu
200
Is Francium radioactive
True
200
At
Halogens
200
Tm
1879
300
Arsenic
5
300
Y+V
YV
300
Is Copernicium radioactive
True
300
Ir
Transition Metals
300
Zr
1789
400
Francium
1
400
Bi+Cs+Mg
BiCsMg
400
Is Meitnerium radioactive
True
400
B
Metalloids
400
Be
1798
500
Zinc
2
500
H+Cl
ClH
500
Is Xenon radioactive
False
500
Np
Actanide
500
B
1808






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