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What are the exact relative masses of protons, neutrons and electrons?
When was the nucleus discovered?
Is vacuum matter? What are ten things that are not matter?
How many quarks are in a proton? How many quarks are in a neutron?
How do you determine how many protons, neutrons, and electrons are in an atom?
How are electrons placed in shells around the nucleus?
What is an alpha particle?
What would happen to the atomic number and the electric charge of an atom if two neutrons escaped the nucleus?
What is the charge of an up quark and the charge of a down quark? How many quarks make up a proton and a neutron?
How do you prove air is matter?
What is the simplest way of explaining what atoms, elements, compounds and mixtures are?
What are the freezing and melting points of krypton?
Will scientists ever find smaller elements or is hydrogen the smallest possible?
What is a material with a freezing point above 0 degrees Celsius?
When studying elements I noticed that there is a boiling point and melting point. What are they?
If you have 11 protons and 12 neutrons this is an atom of what element?
Does sodium have any isotopes? Is it radioactive?
What's the difference between hydrogen, nitrogen, oxygen, neon, copper, gold and magnesium?
Why is hydrogen's atomic number 1?
What is air made of?
What makes hassium an element if it has no uses except basic scientific research?
Why do the electron shells begin being named with K, L, M, N, and not with A, B, C?
How cold is liquid nitrogen?
Why aren't Chlorine-35 and Chlorine-37 two different elements?
How do you separate tungsten from its ore?
What two minerals is the sun made out of?
Is krypton dangerous?
In space we feel weightlessness because the earth's gravity has less effect on us. Why do we not see the effect of the gravitational force between the various objects...
Is there an atom that does not have neutrons?
I am not clear on what a molecule is. If water is a molecule, is it also a compound because the hydrogen and oxygen have been chemically combined? If so...
How many times bigger is a proton than an electron?
Can you crush atoms?
Does gravity affect atoms?
Can you use light to push light?
How much of an atom is empty space?
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