Question

Aluminum has 13 protons and 14 neutrons. What is aluminium mass number?​

Answer 1

Answer:

The isotope Al-27 has 13 protons and 14 neutrons. Aluminum's average atomic mass is 26.981539 AMU.

Explanation:

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Answer 2

The mass number of Al is 27.

• The mass number of an atom is the sum of its number of protons and the number of neutrons.
• The number of protons in Al is 13 and the number of neutrons in Al is 14.
• Hence the mass number of the Al atom is 13+14=27.
• Thus, the mass number of the Al atom is 27.