Can you find the density of a paintball?
exceeds a safe
aries
200 psi
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Paintballs come in various sizes, but a typical paintball will have a
sis diameter of 1.7 cm and a mass of 3.1 grams. Can you determine the
$ density of a paintball? The formula for the volume of a sphere is 4/3 r.
now
The formula for density is m/v.
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You can find the answer on page 20.
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constant. Inversely
Know the rules and

let that person have a turn to speak : )

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.  

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.