Filling of Electrons for Elements

Q. The total number of electrons in the orbit shell is given by the formula 2n square. Then in k shell =2 ; l shell =8 and m = 18. Then the total number of electrons in the sodium is 20. Then why do we write it as 2, 8, 8, 2 instead of writing as 2, 8, 10

Q.

Write the electronic configuration of Oxygen, Chlorine and Sodium according to the Bohr-Bury Scheme.[3 MARKS]

Q.

What is Pauling approach and mullikens approach and Allred Rochow scale

Q.

What is the maximum capacity of shell- K to hold electrons?

1. 4

2. 8

3. 16

4. 2

Q. Atomic Number of O = 8, Electrons in K shell = 2, Electrons in L shell = 6. Configuration = 2, 6

Q.

Explain the rule according to which electrons are filled in various energy levels.

Q. An atom has 2 electron in K shell , 8electron in L shell and 8 electron in M shell .The number f s electron present in the element is

Q.

An electron can only stay in one of the seven possible atomic orbital.

1. True

2. False

Q.

Which shell is occupied by the last electron of Neon?

1. M shell

2. K shell

3. L shell

4. N shell

Q.

Why the electronic configration of pottasium is 2, 8, 8, 1 if maximum electrons in m shell is 18

Q.

Write the electronic configuration of Oxygen, Chlorine and Sodium according to the Bohr-Bury Scheme.
[3 MARKS]

Q. If ais the radius of the 1st shell of H-atom, the wavelength of electron in 3rd shell of He+ is?

Q.

While filling the electron in a Carbon atom, which orbit will be occupied by the last electron getting filled?

1. K shell

2. L shell

3. M shell

4. N shell

Q. The shell closest to the nucleus of an atom is:

1. M
2. K
3. L
4. N

Q. compare the eneregy of electron in first 3 orbits of Hydrogen atom

Q. list all the exceptions of electronic configuration all the elements wid exceptions in chemistry wid the reason behind that

Q.

The electrons in the outer most orbit of X, Y and Z atom are 7, 2 and 3 respectively. The valencies of the atoms are:

1. 7, 2, 3

2. 1, 2, 3

3. 1, 6, 3

4. 1, 3, 2

Q.

The first two orbits of an atom are completely filled with electrons and no electron is there in the third shell. The atomic number of the element is ________.

1. 2
2. 10
3. 18
4. 32

Q.

While filling electrons in Berrylium, the 2nd electron will occupy which orbit?

1. 1st Orbit

2. 2nd Orbit

3. 4th Orbit

4. 3rd Orbit

Q.

Atomic mass = ______

1. Number of protons + Number of neutrons

2. Number of electrons + Number of neutrons

3. Number of electrons + Number of protons

4. Atomic number + Number of neutrons

Q. Match the given elements with their respective valency.

1. 2
2. \N
3. 1
4. 3

Q.

Which of the following shells can have maximum of 2 electrons?

1. K shell

2. N shell

3. M shell

4. L shell

Q.

Which of the following electronic configuration represents a noble gas?

1. 2, 8, 8, 2

2. 2, 8, 2

3. 2, 8, 6

4. 2

Q.

What is the number of electrons that can accommodate in K shell in case of Lithium?

1. 2
2. 3
3. 1
4. 4