how can we predict the hybridisation of nitrogen in NH4+??

plz explain the geometry of the molecule...........

I THINK ITS HYBRIDIZATION IS SP₃..........................   IN OUTERMOST SHELL N HAS 5 ATOMS.........  1 POSITIVE CHARGE...........  4 HYDROGEN ATOMS...............  SO HYBVRIDIZATION IS 1/2(5+4-1) THAT IS 4...SO SP3

APPROVE MY ANSWER

it is sp3 hybrid.................. here we can use the frmula 1\2(N+B-c) where N is no. of valence e- in central atom, b is no. of atoms surrounding it & c is total charge on atom................

using the frmula we get 1\2(5+4-1) = 4 hence sp3 hybridized

Hybridisation is sp3 of NH4 because in outermost shel it have 5 valence electrons and big positive charge and it have four hydrogen atom that is attached to it so formula to calculate hybridisation is 1/2(5+4-1) is equal to 4 so it is sp3