Answer:
true
Explanation:
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It is true
(a) Chlorine the first row Is 1s the second is 2s followed by 2p...etc as Chlorine has 17 electrons
in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
1. Element is Ca
2. 20 electrons
3. 2 valence electrons
4. 4 energy levels