Question

elements in the periodic table are classified into four blocks.This classification is based upon?
A. valence orbital
B. shell
C. sub-shell
D. all of the above
tell me the ri8 answer IMMEDIATELY

Answer 1

D answer is correct. ..

Answer 2

B.sub shell

because
the
all
the
elements
are
arranged
in
spdf
manner
and
these
are
divided
into
4
functional
blocks
.
.
.
.
.
.
.
.
.
.
.
.
h
o
p
e
.
.
i
t
.
.
h
e
l
p
.
.
y
o
u