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it must be 12.

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Q: The atomic number of sodium the first element in Period 3 is 11 The atomic number of the second element in this period is?
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Related questions

What element has the lowest atomic number in period 3?

The element with the lowest atomic number in period 3 is sodium (Na) with an atomic number of 11.


How does the atomic number change in a period?

When going left to right across a period, the atomic number of element increases.


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The element that has an atomic number of 36 is Krypton, a noble gas in period 4.


What is the period number of the element nickel?

you mean atomic number and it is 28


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Why is argon the last element in its period?

The reason Argon is the last element in its period is that it has the highest atomic number in its period, and that's the way all periods are arranged.


What is the range of atomic numbers of the element in the sixth period?

From atomic number 55 to 86


What period is in calcium if atomic number 20?

Calcium is a non metal element. Atomic number of it is 20.


Why and how element are arranged in 4th period?

Increasing atomic number by 1


What is the fifth period transition element with greatest atomic number?

Boron


What does the period number tell us about the element?

For elements it's the atomic number not the "Period Number." This number tells you how many protons a single atom of that element has in its nucleus. The "period number" is a dimensionless quantity used in fluid dynamics.


What element is a nonmetal in period 3 atomic mass 12?

No element in period 3 has an atomic mass of 12.