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What does the atomic mass number represent

How many total elements are in the following chemical equation? 2H2O + O2--> 2H2O

Chemical equations and periodic table

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Answers

1
How many total elements are in the following chemical equation? 2H2O + O2--> 2H2O
2
4
10
3
2
What does the atomic mass number represent
Number of Electrons
Number of protons and electron
Number of Protons and Electrons
Number of Protons
3
How many total atoms are in the following equation? 2H2O+O2 --> 2H2O
21
7
10
14
4
How many atoms in table salt, NaCl?
2
4
3
1
5
What is the name of the left side of a chemical equation?
Reactants
chemical imbalance
Productions
Yields