Which of the following are elements? (Select all that apply.)
KCl
Na
C
H2O

Na(Sodium) and C(Carbon) only

Na, C

Explanation:

1. KCl, or potassium chloride, is a combination of two elements- so it's a chemical compound.

2. Na, or sodium, can be found on the periodic table of elements. Therefore, it is an element.

3. C, or carbon, can also be found on the periodic table of elements. Therefore, it is an element.

4. H20, or water, is a combination of 2 hydrogen atoms that bonded into an oxygen atom. Combination of 2 or more elements is a chemical compound.

Therefore, the answers are Na and C.

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