Noble Gases

Q.

Is there any easiest way to remember the atomic number of the element in the periodic table?

Q.

Why do you think the noble gases are placed in a separate group?

Q. The noble gases are unreactive because

1. they have a large number of protons.
2. their valence shell is completely filled with electrons.
3. their valence shell is half filled with electrons.
4. they have a large number of neutrons.

Q.

Name or state the following with reference to the elements of the first three periods of the periodic table.
(a) Noble gas with duplet arrangement of electrons.

(b) Metalloid in Period 3.

(c) Valency of elements in Group 14 and Group 15.

(d) Noble gas having electronic configuration : 2, 8, 8.

Q.

Which one of the following elements has two valence electrons but is a noble gas?

1. Krypton

2. Neon

3. Argon

4. Helium

Q.

What are the names of the elements in group zero?

Q.

What is noble gases

Q. If argon contains only 1 atom (Ar) how can we call it as a molecule?
because in my text book its given that "MOLECULES of many element such as argon (Ar), helium (He) ..etc are made of only 1 type of atom". If they are made of only 1 tyoe of atom, how can it be callled as a molecule?

Q.

Atoms of most elements are not able to exist independently. Why?

1. They can form more stable substances by combining.

2. Most of the Atoms are reactive.

3. Most of the atoms are reactive and can form more stable substances by combining.

4. They are always unstable.

Q.

What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?

Q.

11. What are representative elements? Why are they so called?

Q.

Why halogens are so reactive?

Q.

The family of nonmetals having valency one. Write the names from the description.

Q. Give reasons
isotopes of an element are chemically similar
noble gases show least reactivity

Q.

What is a Non-metal in Group 13?

Q. Do atoms have independent existence as like molecules?

Q.

A chlorine ion is positively charged.

1. True
2. False

Q.

Is nitrogen a noble gas?

Q.

Which noble gas has only two electrons in its valence shell?

1. Radon

2. Krypton

3. Neon

4. Helium

Q.

Are relative atomic masses of elements whole numbers?

Q. why noble elements do not combine with other elements to form compounds?

Q. Why are some elements chemically inert?

Q.

Which of the following pair are members from the same group of periodic table?

1. Mg, Cu

2. Mg, Cl

3. Mg, Ba

4. Mg, Na

Q. Question 4 (b)
What property do all elements in the same column of the periodic table as fluorine have in common?

Q.

The inert gas present in the second long period is Xe.

1. True
2. False

Q.

In the first 20 elements Helium, Neon and Argon are very much inert. Can you predict about their ineptness seeing their electronic configuration.

Q.

Xenon is treated as noble gas but when you see its electronic configuration , you will come to know that it's outermost shell have four electrons instead of eight electrons. This same happens with krypton also. I want to know why?

Q.

The compound which does not contain ionic bond is:

1. $\mathrm{NaOH}$

2. $\mathrm{HCl}$

3. ${\mathrm{K}}_2\mathrm{S}$

4. $\mathrm{LiH}$

Q.

Assertion: The group 18 consists of elements which are in gaseous state under ordinary conditions
Reason: All the elements of group 18 have stable configuration

1. Both assertion and reason are true and reason is the correct explanation of assertion

2. Both assertion and reason are true but reason is not the correct explanation of assertion

3. Assertion is true but reason is false

4. Both assertion and reason are false

Q.

Which element can be used to prevent evaporation of the filament of an electric bulb?

1. Argon

2. Radon

3. Neon

4. Helium