Question

What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?​

Answer 1

• The mass number (A) of this atom is 55

Atom information–

• Atomic number (Z) = 26
• Protons (p⁺) = 26
• Neutrons (n⁰) = 29
• Electrons (e⁻) = 26

• The atomic number (Z) of an atom is the number of protons (p⁺) it has

• The mass number (A) of an atom is characterized by the sum of the amount of protons (p⁺) with its neutrons (n⁰)

Substituting values –

`\qquad`
`\twoheadrightarrow\bf A=p^(+)+n^(0)`

`\qquad`
`\twoheadrightarrow\bf A=26+29`

`\qquad`
`\twoheadrightarrow\bf A=55`

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