The correct order of increasing energy of atomic orbital is:
1. 3s, 3p, 4s, 3d, 4p
2. 3s, 3p, 3d, 4s, 4p
3. 3s, 3p, 4s, 4p, 3d
4. 3s, 3p, 3d, 4p, 4s
The quantum number of the most energetic electron in an Ne atom in the first excited state is
1. | 2, 1, 0, +1/2 | 2. | 3, 1, 1, +1/2 |
3. | 3, 0, 0, +1/2 | 4. | 3, 1, 0, +1/2 |
An atom forms an ion by losing three electrons. The ion has an electronic configuration [Ar]3d6. The symbol of the ion is :
1. | Fe3+ | 2. | Ni3+ |
3. | Co3+ | 4. | Mn+3 |
The electronic transition in the hydrogen atom that emits maximum energy is:
1. 2 1
2. 1 4
3. 4 3
4. 3 2
The mass ratio of photons corresponding to the first lines of the Lymann and the Balmer series of the atomic spectrum of hydrogen is :
1. | 5 : 27 | 2. | 1 : 4 |
3. | 27 : 5 | 4. | 4 : 1 |
If the size of the first orbit of the hydrogen atom is 5.29 nm, the size of the second orbit of He+ is
1. 2.65 nm
2. 21.16 nm
3. 10.58 nm
4. 5.29 nm
An absorption line of the lowest frequency in the transition of hydrogen spectra is:
1. n=1 to n=2
2. n=3 to n=8
3. n=2 to n=1
4. n=8 to n=3
Which of the following has greater number of electrons than neutrons?
1. Al3+
2. O2-
3. F-
4. C
The transition in the He+ ion in the balmer series that would have the same wave number as the first Lyman line in the hydrogen spectrum is-
1. | \(2 \rightarrow1\) | 2. | \(5 \rightarrow3\) |
3. | \(4 \rightarrow2\) | 4. | \(6 \rightarrow4\) |
The number of electrons in 19 K with quantum numbers n=3; l=0 is/are:
1. 2
2. 1
3. 4
4. 3