Question

For a bromine (Br) atom in its ground electronic state:

How many electrons are there in the 4s orbital?    (Enter an integer.)

How many electrons are there in the 3d orbitals?    (Enter an integer.)

How many electrons are there in the 4p orbitals?    (Enter an integer.)

How many unpaired electrons are there?    (Enter an integer.)

To what block does this atom belong?    (Enter s, p, d, or f.)

Answer 1

The atomic number of Bromine is 35. So the electronic configuration in the ground state according atomic orbital theory in the increasing order of energy

1s^2 ,2s^2, 2p^6 ,3S^2 ,3P^6 ,3d^10, 4s^2, 4p^5

Ground state is the most stable state ,here no excitation of electron take place by absorbing energy.

(a)The number of electron in the 4s orbital is 2.

(b) The number of electrons in 3d orbital is 10.

(c)The number of electrons in the 4p orbital is 5.

(d)The number of unpaired electron is 1.

(e) Bromine belongs to P block element because last electron enter into Valence shell P orbital