Which statement about the effusion rates of nitrogen and oxygen is true?
oxygen effuses 1.07 times faster than nitrogen.
nitrogen effuses 1.07 times faster than oxygen.
oxygen effuses 0.9 times faster than nitrogen.
nitrogen effuses 0.9 times faster than oxygen.

Nitrogen effuses 1.07 times faster than oxygen.

Explanation:

To calculate the rate of effusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

On solving we get:

Hence, Nitrogen effuses 1.07 times faster than oxygen.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.