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Number 8? what is the solution pls???​
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4 votes
Number 8?
what is the solution pls???​

Number 8? what is the solution pls???​-example-1
User Valeri Atamaniouk
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4.6k points

1 Answer

4 votes

Answer:

1st group (or 1A in some tables)

Step-by-step 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.

User Mdeous
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