What is the first element on the periodic table?
The elements are ordered by atomic number, which is the number of protons in the nucleus -- and atomic number 1 is hydrogen.
You can access an updated periodic table at https://tutor.hix.ai which goes from hydrogen to oganesson (atomuc number 118).
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Hydrogen is the first element on the periodic table.
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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.
- What is the trend in atomic radius as you go across a period?
- How can a periodic table be used to determine the charge of an ion?
- How are the elements differentiated? And how many protons occur in hydrogen, helium, and lithium?
- How many valence electrons does iron have?
- What is the chemical name of iron?

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