Orbits

Q.

Explain Bohr-Bury scheme.

Q. The maximum number of electrons that can be accommodated in the outermost orbit is ___ .

Q. Why does M shell accomodate only 8 electron even when it's capacticy is 18 that is in case of Potassium ?

Q. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Q. What are K, L, M, N shells?

Q. Electrons revolve around the nucleus in circular orbits called shells.

1. False
2. True

Q. A phosphorus atom has a total of 15 electrons. Its outermost shell is _____ and it has ___ valence electrons.

1. L; 8
2. L; 5
3. M; 8
4. M; 5

Q.

What are the shells around the nucleus? K, L, M, N, O, P are the shells around the nucleus of an atom. Which shell is (a) nearest to the nucleus and (b) farthest from the nucleus?

Q.

What are valence electrons? Give example.

Q.

Give two postulates of the Bohr's atomic model.

Q. Question 17
Number of valence electrons in $C{l}^{-}$ ion is:

(a) 16
(b) 8
(c) 17
(d) 18

Q.

Which subshell has no orbital?

Q.

What is the maximum number of electrons that can be present in a given shell according to the Bohr-Bury scheme?

Q. According to Bohr, the ______ do not radiate energy while revolving in discrete orbits.

1. nuclei
2. neutrons
3. protons
4. electrons

Q.

What is the maximum number of electrons that can be filled in the outermost shell?

1. 18

2. 8

3. 32

4. 16

Q.

Explain with suitable examples, Bohr-bury scheme for the distribution of electrons in different orbits in an atom.

Q. The correct schematic atomic structure of sulphur is

1. 
2. 
3. 
4. 

Q.

The maximum number of electrons in any shell is given by the formula ________.

Q.

The equation for the calculation of energy of n^th orbit of hydrogen atom derived by Bohr is _.

Q.

How can we distribute atoms in shell

Q. What are s, p, d and f orbitals?

Q.

The K shell can accommodate _______ electrons whereas L can accommodate ________ electrons.

Q. In Niels Bohr model of the atom, the orbits or shells are represented by the letters:

1. A, B, C, D
2. P, Q, R, S
3. K, L, M, N
4. W, X, Y, Z

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Correct the following incorrect statements:
1. The first shell in Bohr's Atomic model is represented by the letter "A".
2. The maximum number of electrons that can go in the shell "N" is 48.
3. The mass number of an atom equals the sum of the number of protons and electrons present in the nucleus of an atom.

Q.

State two important rules of Bohr-Bury scheme.

Q.

Electrons in an atom revolve around the nucleus in certain selected concentric paths which are called orbits. Which of the following orbit do you think will have highest energy?

1. M orbital

2. N orbital

3. L orbital

4. K orbital

Q. How principal quantum number determine energy of orbitals?

Q.

Complete the following table:

Symbol	Atomic number	Mass number	Protons	Neutrons	Electrons	Electronic configuration
Beryllium ${}_4{}^9\mathrm{Be}$	4

Q. In Niels Bohr model of the atom, the orbits or shells are represented by the letters:

1. P, Q, R, S
2. W, X, Y, Z
3. A, B, C, D
4. K, L, M, N

Q. What is the maximum number of electrons that can be accommodated in the M shell of an atom?

1. 10
2. 8
3. 2
4. 18