Number 8?
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Ответ:
1st group (or 1A in some tables)
Explanation:
Mass number = number protons + number neutrons
23 = number protons + 12
number protons = 23 - 12= 11, so atomic number is 11.
Sodium (Na) has an atomic number 11.
Sodium is in the 1 group, or 1A group in some Periodic tables.
Ответ:
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Explanation: