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vlada-n [284]
3 years ago
11

Number 8?what is the solution pls???​

Chemistry
1 answer:
vekshin13 years ago
6 0

Answer:

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.

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