Molecular Formulas and Mendeleev's Periodic Table Quiz

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Questions and Answers

Which elements belong to the second period in the modern periodic table?

  • K, Ca, Sr, Ba, Ra
  • Li, Be, B, C, N, O, F, Ne (correct)
  • Na, Mg, Al, Si, P, S, Cl, Ar
  • Mg, Ar, Al, Si, P, S, Cl

Are the number of valence electrons the same for all elements in the second period?

  • No (correct)
  • The question is not clear
  • It varies between 1 and 8
  • Yes

Do all elements in the second period have the same number of shells occupied by electrons?

  • All elements except Ne
  • No
  • Not enough information to answer
  • Yes (correct)

What is the trend in atomic number within a period from left to right?

<p>Increases by one (D)</p> Signup and view all the answers

How does the number of valence electrons change within a period from left to right?

<p>Increases by one (B)</p> Signup and view all the answers

Which elements have electrons in the three shells K, L, and M?

<p>Na, Mg, Al, Si, P, S, Cl, Ar (C)</p> Signup and view all the answers

Which elements are located in the third period of the periodic table?

<p>Na, Mg, Al, Si, P, S, Cl, Ar (A)</p> Signup and view all the answers

Which elements have electrons in two shells K and L?

<p>(Li - Ne) excluding F (B)</p> Signup and view all the answers

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