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Decrease in atomic number is observed in...

Decrease in atomic number is observed in :

A

`alpha`-emission

B

`beta`- emission

C

positron emission

D

electron capture

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
`alpha`- emission : `""_(z)^(m)A to_(z-2)^(m-4) B + "_(2)^(4)He` (z decreases)
`beta`- emission : `""_(z)^(m) A to ""_(z+1)^(m)B + ""_(-1)^(0)e`
Positron emission : `""_(1)^(1)P to ""_(0)^(1)n + ""_(+1)^(-0)e` (z decreases)
K - electron capture : `""_(1)^(1)P + ""_(-1)^(0)e to ""_(0)^(1)n + X` - ray (z decreases)
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Knowledge Check

  • The best reason to account for the general tendency of atomic diameters to decrease as the atomic numbers increase within a period of the periodic table is the fact that

    A
    Outer electrons repel inner electrons
    B
    Closer packing among the nuclear particles is achieved
    C
    The number of neutrons increases
    D
    The increasing nuclear charge exerts a greater attractive force on the electrons

  • The best reason to account for the general tendency of atomic diameters to decrease as the atomic number increase within a period of the periodic table is the fact that

    A
    Outer electrons repel inner electrons
    B
    Closer packing among the nuclear particles is achieve
    C
    The number of neutrons increases
    D
    The increasing nuclear charge exerts a greater attractive force on the electrons