Any science fair questions for 8th graders? list at least 4

How does water purity affect surface tension?

When is the best time to plant soy beans?

Which material is the best insulator?

How does arch curvature affect load carrying strength?

How do different foundations stand up to earthquakes?

What sugars do yeast use?

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.