For sodium, Na is the _____.
If the element copper has 29 protons, how many electrons does it have?
What does the group of an element tell you?
What does the period of an element tell you?
If someone is bit by a fire ant, the bite is painful because of the acid it contains. Which of the following would help with this pain?
Why are not all molecules also compounds?
Scientist ____ developed a simplified model of an atom.
A ____ reaction occurs when a compound is broken down into simpler compounds.
A substance that changes color when exposed to acid or base solutions is called a(n)
The sum of the number of protons and neutrons results in an atom's approximate _____.
When positively and negatively charged ions attract each other they form a(n) _____.
The compound H2CO3 has ____ atom(s) of carbon in it.
The scientist ___ developed the periodic table of elements.
You can determine the concentration of acids or bases in a solution by using ____.
In a(n) ____ atoms share electrons.
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