Stability and Octet Configuration

Q. Why aluminium chloride forms covalent compound

Q. During the formation of magnesium chloride, magnesium atom loses ______ electrons to attain the stable electronic configuration.

1. one
2. three
3. four
4. two

Q.

A covalent molecule having two lone pair of electrons

Q.

Which element will form a cation in a salt?

1. Sodium

2. Carbon

3. Fluorine

4. Oxygen

Q. Why only one atom of oxygen is not available in nature ?

Q.

Name the stable compounds that are formed when metals react with non-metals.

Q.

An atom with $3$ protons and $4$ neutrons will have a valency of

1. $3$

2. $7$

3. $1$

4. $4$

Q. Arrange the given elements in the increasing order of their valency:

1. Lithium
2. Beryllium
3. Boron
4. Carbon

Q. Atoms bond together to achieve noble gas configuration.

1. True
2. False

Q. Atoms tends to have eight electrons in the valence shell.

1. False
2. True

Q.

Compound X consists of molecules. In the liquid state, X will :

1. behave as an electrolyte
2. conduct electricity
3. not conduct electricity
4. become ionic

Q. How many electrons are present in the valence shell of magnesium?

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

Q. Statement I: Lithium needs less energy to have an electron knocked off from its outermost orbit than does helium.

Statement II: Lithium has one electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons.

1. Statement I is false. Statement II is false.
2. Statement I is true. Statement II is true. Statement II is the correct explanation of statement I.
3. Statement I is true. Statement II is true. Statement II is not the correct explanation of statement I.
4. Statement I is true. Statement II is false.

Q.

In the figure, you might have observed that Helium and Neon have higher ionization energies compared to the others . This means that they are-

1. very stable

2. very large in size

3. very unstable

4. gases

Q. In a lewis structure, the are represented as dots.

1. valence electrons
2. positive kernels
3. inner electrons

Q. All elements achieve octet configuration by:

1. gaining electrons
2. losing electrons
3. sharing electrons
4. creating electrons

Q. All the elements in a group have:

1. same mass number
2. same number of shells
3. same number of valence electrons
4. same number of isotopes