The number of electrons in $[_{19}^{40}K]^{-1}$ is

  • A
    $19$
  • B
    $40$
  • C
    $18$
  • D
    $20$

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The composition of tritium $(_{1}H^{3})$ is:

$A$: Atoms with the same mass number but different atomic numbers are called isobars.
$R$: In isobars,the sum of protons and neutrons is always different.

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On comparing the chemical reactivity of $C^{12}$ and $C^{14}$,it is revealed that:

The number of protons,neutrons,and electrons in the element $_{89}X^{231}$ are respectively:

Assertion : Atoms are not electrically neutral.
Reason : Number of protons and electrons are different.

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