Tag: alkali metals

Questions Related to alkali metals

The element having very high ionization enthalpy but zero electron gain enthalpy is: 

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. H

  2. F

  3. He

  4. Be

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Correct Option: C
Explanation:

Inert gases have very high ionization enthalpy and zero electron gain enthalpy. So the correct answer is He.

Which of the following exists as an individual gas-phase atom under standard conditions?

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. $\displaystyle C$

  2. $\displaystyle N$

  3. $\displaystyle O$

  4. $\displaystyle F$

  5. $\displaystyle Ne$

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Correct Option: E
Explanation:

Option E is the correct answer.

${Ne} $ or Neon is an inert gas. It has a complete octet (2,8) with 8 electrons in its outermost orbit and is highly stable. And thus under standard conditions it remains as an individual gas phase atom without forming a molecule. 

Group contains the noble gases is_______ group.

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. 16th

  2. 17th

  3. 18th

  4. Both B and C

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Correct Option: C
Explanation:

Group 18 contains noble gases.


They have already stable and octet configuration that is they contain 8 electrons in their outer most shell.

Hence they have high ionization potential and zero electron affinity.

They do not participate in chemical bonding because already they are stable.

Option C is correct.

Inert gases are otherwise called zero valent elements.
State whether the given statement is true or false.

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. True

  2. False

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Correct Option: A
Explanation:

Given statement is true.
In general noble elements have a stable configuration that is octet configuration with all orbitals filled. Hence no tendency in either accepting or donating electrons. This is why those are called zero valent elements. 

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

study of specific groups alkali metals periodic trends in chemical properties the periodic table chemistry

  1. True

  2. False

  3. Either

  4. Neither

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Correct Option: A
Explanation:

Xe is present in 5th period of periodic table.


The period 4 and 5 are called long periods.
 
So, the Xe is present in second long period.

The atomic number not found under the zero group elements is: 

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. 16

  2. 18

  3. 36

  4. 54

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Correct Option: A

Why noble gases are generally non-reactive?

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. Because they are classified as zero group elements

  2. Because they are in gaseous state

  3. Due to their stable electronic configuration

  4. Because they are p-block elements

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Correct Option: C

The electronic configuration of Argon is:

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. $1s^2, 2s^22p^6, 3s^23p^6$

  2. $1s^2, 2s^22p^6, 3s^23p^2$

  3. $1s^2, 2s^22p^6, 3s^23p^4$

  4. $1s^2, 2s^22p^6, 3s^23p^63d^{10}, 4s^24p^6$

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Correct Option: A

All the naturally occurring noble gases are non-reactive except:

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. Argon

  2. Helium

  3. Xenon

  4. Radon

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Correct Option: C

The number of naturally occurring noble gas elements are:

chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

  1. 8

  2. 7

  3. 6

  4. 9

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Correct Option: C