Consider sodium, which has an atomic number of 11 and an atomic mass of 23. How many valence electrons does it have?
In which Group of the Periodic Table, which vertical column, does sodium lie?
This should be pretty obvious. And the number of this Group gives the number of valence electrons...
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Alternatively, as anor277 stated, one could use the group number (without counting the transition metals) to find the number of valence electrons of an element.
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Sodium has 1 valence electron.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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