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The atomic radius increases as we move d...

The atomic radius increases as we move down a group because

A

Effective nuclear charge increases

B

atomic mass increases

C

additive electrons are accommodated in new electron level

D

atomic number increases.

Text Solution

Verified by Experts

The correct Answer is:
C
As we move down a group, additive electrons occupy new energy levels and therefore, atomic radius increases.
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Assertion. Cu, Ag and Au lie in Group II of the periodic table. Hence, their atomci radii are in the order Cu lt Ag lt Au Reason . In any group of transition elements,the atomic radii increaseas we move down the group.

Atomic radius goes on increasing down a group

Knowledge Check

  • Assertion: Cu, Ag and Au lie in Group 11 of the periodic table. Hence their atomic radii are in the order CultAgltAu Reason: In any group iof the transition elements, the atomic radii increase as we move down the group.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
    C
    If (A) is correct, but (R) is incorrect.
    D
    If (A) is incorrect but (R) is correct.

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    effective nuclear charge increases
    D
    electrons are added removed.

  • The angle of dip increases as we move from

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    B
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    dip is equal at all places
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    Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. You will see that the atomic size increases down the group. This is because new shells are being added as we go down the group. This increases the distance between the outermost electrons and the nucleus so that the atomic size increases in spite of the increase in nuclear charge. As we can see, the metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid because it exhibits some properties of both metals and non-metals. In the Modern Periodic Table, a zig-zag line separates metals from non-metals. The borderline elements - boron, silicon, germanium, arsenic, antimony, tellurium and polonium - are intermediate in properties and are called metalloids or semi-metals. (b) Why does the atomic size increase when we move down the group ?

    Atomic radius goes on increasing down a group.

    Give reasons - K atom is bigger than Na atom even though both these elements belong to same group. The metallic character of elements increases as we move down a group. Mg atom is smaller than Na even though these elements belong to same period.

    Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. You will see that the atomic size increases down the group. This is because new shells are being added as we go down the group. This increases the distance between the outermost electrons and the nucleus so that the atomic size increases in spite of the increase in nuclear charge. As we can see, the metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid because it exhibits some properties of both metals and non-metals. In the Modern Periodic Table, a zig-zag line separates metals from non-metals. The borderline elements - boron, silicon, germanium, arsenic, antimony, tellurium and polonium - are intermediate in properties and are called metalloids or semi-metals. (c) What are semi-metals or metalloids ?

    Metallic nature increases moving down the group because:

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