Which statement best describes balancing equations and the law of conservation of mass?
there are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the
products
the number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and
in the products,
there are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the
products
there are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the
products
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The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and  in the products

Explanation:

Law of Conservation of mass : It states that mass in an isolated system can neither be created nor destroyed during any physical and chemical change.

This is discovered by Antoine Lavoisier

or

Total mass of reactants is equal to total mass of products in a chemical reaction.

Balancing equation follow law of conservation of mass.

Consider the following equation :

Reactants : and

Reactants : Number of hydrogen(H) atom = 2(2) = 4

                   Number of oxygen (O) atom   = 2

Products  :  

                : Number of hydrogen (H) = 2(2) = 4

                : Number of oxygen (O)    = 2(1) = 2

Total number of hydrogen, and oxygen in the reactant side is equal to total number of hydrogen, and oxygen in the product side.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

that tool would be a compass