Question

Which the
contains
following
atom
other than hydrogen) which
lacks
octet of
valence
electrons ?
an
(1) H3O+
(2) NH4 +
(3) NH3
(4) BH3
​

Answer 1

Answer:

In BH3 octet is not completed so BH3 dimerise into B2H6

Answer 2

Answer:

all are to get octet valence

octet valence means six of valence electrons

hope it is helpful to you