52. The reaction of calcium hydride, CaH2, with water can be characterized as a Lewis acid-base reaction: CaH2(s) + 2H2 O(l) ⟶ Ca(OH)2(aq) + 2H2(g)

Identify the Lewis acid and the Lewis base among the reactants. The reaction is also an

oxidation-reduction reaction. Identify the oxidizing agent, the reducing agent, and the changes in

oxidation number that occur in the reaction.

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.