Electronic Configuration

Q. Electronic configuration of first 30 elements with table full explanation

Q.

Draw the electron dot structure of Methane.

Q. What is the electronic configuration of ${}_{18}^{40}\text{Ar}$?

1. 1, 8, 9
2. 2, 8, 8
3. 2, 8, 18, 12
4. 2, 8, 8, 3

Q.

The number of neutrons in the radioactive isotope of carbon is _______.

Q. An element has an atomic number 19. How many electrons are there in K, L, M, N shells of its atom?

1. 2, 8, 8, 1
2. 2, 7, 8, 2
3. 3, 7, 7, 2
4. 3, 7, 8, 1

Q. In an atom valence electrons are present in:

1. outermost orbit
2. middlemost orbit
3. first orbit
4. any one of its orbit

Q. Which of these elements have a fully filled outermost shell?

1. Hydrogen
2. Sodium
3. Neon
4. Carbon

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. 18
2. 2
3. 10
4. 32

Q. Why does an atom does not react if it has with 8 electrons in 3rd energy level like Argon gas?

Q.

The maximum number of electrons that can occupy the shell K, L, M, N respectively are:

1. 2, 8, 16, 32

2. 2, 8, 8, 16

3. 2, 8, 8, 32

4. 2, 8, 18, 32

Q.

Extremely electropositive metals are present in ________ and ________ groups.

Q. Which of the following electronic configuration represents a highly electropositive element?

1. $\left[He\right]2s^1$
2. $\left[Xe\right]6s^1$
3. $\left[Xe\right]2s^2$
4. $\left[He\right]2s^2$

Q. Complete the table by finding out the valency of each of the given elements.​

​ Elements	valency ​
Cl​	​
Mg​	​
Ca​	​

Q. The electronic configuration of an element is 2, 8, 8, 1. (i) State its group number and period number in the modern periodic table. (ii) State whether this element is a metal or a non-metal. Give reason for the justification of your answer in each case

Q. Identify all the elements.

1. Air
2. Hydrogen
3. Salt
4. Sodium
5. Oxygen
6. Nitrogen
7. Water
8. Sulphur
9. Potassium

Q.

What is the electron configuration of ${\mathrm{Hg}}^{2+}$?