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Subjects
Science CBSE
Class 9
Structure of the atom
Textbook questions
12.
Exercise XII
Exercise condition:
3
m.
If
Z = 3
, what would be the valency of the element? Also, name the element.
Z
=
Atomic number
=
3
∴ Electronic configuration
=
(
2, 1
)
(
2, 8
)
(
2, 3
)
The electrons in the outermost shell
=
3
8
1
, hence, valency
=
3
8
1
The element with atomic number
3
is
helium
lithium
boron
.
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