Octet Rule

Q. Elements in the periodic table with valency and mass number

Q.

What is KLMN?

Q.

What is meant by octet and duplet? Give exam­ples.

Q.

Mention the basic tendency of an atom which makes it to combine with other atoms.

Q.

Geometry of the Xenon oxyfluoride (${\mathrm{XeOF}}_4$) is________

Q.

The electronic configuration of Fluoride ion is the same as that of a Neon atom. What is the difference between the two ?

Q. The electronic configuration of sodium atom is 2, 8, 1 and chlorine atom is 2, 8, 7. The atoms will form a bond by of electrons.

1. covalent
2. ionic
3. sharing
4. transferring

Q.

How do atoms attain noble gas configuration ?

Q.

Why is the electronic configuration of calcium 2, 8, 8, 2 but not 2, 8, 9, 1?

Q.

Write the symbol of the Carbonate ion.

Q.

___ has the highest value of electron gain enthalpy.

1. Sodium

2. Sulphur

3. Argon

4. Chlorine

Q.

Can halogens bond with each other?

Q.

In Which Pair Of Species, The Octet Rule Is Not Obeyed?

1. ${\mathrm{CF}}_4\mathrm{And}{\mathrm{NF}}_3$

2. ${\mathrm{NH}}_3\mathrm{And}{\mathrm{NCl}}_3$

3. ${\mathrm{BCl}}_3\mathrm{And}{\mathrm{PCl}}_5$

4. ${\mathrm{PF}}_3\mathrm{And}{\mathrm{POCl}}_3$

Q.

Explain :

(a) octet rule for formation of sodium chloride

(b) duplet rule for formation of hydrogen.

Q. What is the cause of chemical combination How is the number of valance electrons related to combination capacity of an atom

Q.

Lithium, sodium and potassium react with water and liberate hydrogen gas. What is the similarity in these elements?

Q.

The maximum number of electrons that can be accommodated in an orbit is given by the formula _______ where n is the number of orbit.

1. 2n²

2. 2n + 2

3. 2(n + 2)

4. 2/n²

Q. (b) In the formation of carbon tetrachloride molecule, state the following:
(i) Electronic configuration of nearest inert gas attained.
(ii) How many electrons are shared/transferred in bond formation
(iii) Which type of bonds these compounds form?
(iv) Draw their orbital diagrams.

Q.

Which element has the highest first ionization energy?

1. N

2. Ne

3. H

4. He

Q.

Explain the octet rule for the formation of a molecule of sodium chloride from sodium and chlorine atoms.

Q.

Assertion (A) Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.

Reason (R) This is because sodium and chloride ions acquire octet in sodium chloride formation.

Choose the correct option.

Q.

Which of the following will not conduct electricity?

1. Ionic compounds

2. Metals

3. Water

Q. How to differentiate elements as metals and non metals by looking at their valencies?

Q.

According to modern periodic table, the number of electron shells around the nucleus of an atom represents its_____ in the periodic table.

Q.

Statement 1: If an orbit has 8 electrons, then it will be the outermost orbit of that atom.
Statement 2: The outermost orbit of the atom always has 8 electrons.

1. Only Statement 1 is true.

2. Only Statement 2 is true.

3. Both Statement 1 and Statement 2 are true.
4. Both Statement 1 and Statement 2 are false.

Q. For the formation of a chlorine molecule, each chlorine atom shares ________ electron(s) to form a ________ covalent bond.

1. 3, triple​
2. 1, single​
3. 1, double​
4. 2, double​

Q. Which scientist gave the concept of a molecule?

Q. Expanded octet occurs in:

1. $N{H}_3$
2. $P{F}_5$
3. $H_{2}O$
4. $O_2$

Q.

Name a few elements that exhibit covalency.

Q. What does an atom's stability depend on?