Question

1.What atoms are indicated by the following electronic configurations.
a) 1s2 2s2 2p1 b) (Ar) 4s2 3d1
2.Give the electronic configurations of Na+ , N2+
3.What are the atomic numbers of elements whose outer most electrons are represented by
a) 3s1 b) 2p3 c) 3d6
4.Correct the following electronic configuration of the element in the ground state.
a) 1s2 2s2 2p6 3s2 3p6 3d5
5.An electron is in one of the 3d orbitals. Give the possible values of n.l,m for this electron. 6. How many electron in an atom have the following quantum numbers
a) n=4 s= -1/2 b) n=3 ,l=0.

Answer 1

Answer:

(i) (a) The electronic configuration of H

−

is 1s

2

(b)The electronic configuration of Na

+

is 1s

2

2s

2

2p

6

(c)The electronic configuration of O

2−

is 1s

2

2s

2

2p

6

(d) The electronic configurations of F

−

is 1s

2

2s

2

2p

6

(ii) The atomic numbers of elements whose outermost electrons are represented by (a)3s

1

(b)2p

3

and(c)3d

1

are 11 (Na), 7 (N) and 21 (Sc) respectively.

(iii) The following configurations indicates

(a) [He]2s

1

(b) [Ne]3s

2

3p

3

(c) [Ar]4s

2

3d

1

(a) Li (Z=3), (b) P(Z=15) and (c) Sc Z=21) respectively.

Answer 2

Answer:

first question answer is b

second question answer b

third question answer a

4th question answer a

give question answer b