8 Questions
Which elements belong to the second period in the modern periodic table?
Li, Be, B, C, N, O, F, Ne
Are the number of valence electrons the same for all elements in the second period?
No
Do all elements in the second period have the same number of shells occupied by electrons?
Yes
What is the trend in atomic number within a period from left to right?
Increases by one
How does the number of valence electrons change within a period from left to right?
Increases by one
Which elements have electrons in the three shells K, L, and M?
Na, Mg, Al, Si, P, S, Cl, Ar
Which elements are located in the third period of the periodic table?
Na, Mg, Al, Si, P, S, Cl, Ar
Which elements have electrons in two shells K and L?
(Li - Ne) excluding F
Test your knowledge on writing molecular formulas of compounds with hydrogen based on Mendeleev's periodic table. Learn about the relationship between electron number, atomic number, and the periodic table through the lens of the Modern Periodic Law.
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