Electron Distribution in Different Orbits

Q.

What is the electronic configuration of Scandium?

Q. Identify the correct electronic configuration for ${\text{Mg}}^{2+}$ ion.

1. 
2. 
3. 
4. 

Q. Which of the following statements are true about an element having an atomic number of 11?

1. It has 2 electrons in its K shell.
2. It has 2 electrons in its M shell.
3. It has 9 electrons in its L shell.
4. It has 8 electrons in its L shell.

Q.

State Bohr-Bury formula for determining the number of electrons in a given shell.

Q.

Explain with the help of atomic or orbital structural diagram for the formation of the following :

Calcium oxide

Q.

An atom or ion attains ______ when it reaches octet configuration.

1. Instability

2. Stability

3. Eternity
4. Infinity

Q.

The valency of an atom can be found from its electronic configuration of its atom.Write the electronic configuration of ${}_{19}{}^{39}\mathrm{K}$ and hence its valency as well as the formula of its chlorides and oxides.

Q. Which among the following shell is at the highest energy level?

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

Q. An element X has 7 electrons in its L shell. What is true about the element X ?
I. It belongs to period 9 of modern periodic table.
II. Its atom contains 9 protons.
III. It has a valency of 1.
IV. Its atoms can accept an electron to acquire noble gas configuration.

1. (II), (III), (IV)
2. (III) and (IV)
3. (II) and (IV)
4. (I) and (II)

Q. The electrons revolve around the nucleus.