Respuesta :

Answer:

False

Explanation:

  • Mass of the atom is mostly contributed by nucleus.
  • Nucleus consists of Protons and Neutrons
  • Mass number defined by No of protons+No of neutrons

Answer:

False

Explanation:

Electrons are the lightest particles of an atom with a mass aptoximate to zero

formular:

[tex]{ \rm{ {}^{ \: \: \: 0} _{ - 1} e}}[/tex]

hence mass number = 0

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