If the following processes take place at constant pressure, which will be exothermic and which will be endothermic? Gasoline burns. Two solids at room temperature are mixed and the temperature of the mixture decreases to 15 °C.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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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.

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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.  

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