What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF6 to that of 235UF6 at constant temperature? Express your answer to three significant figures.

The ratio (in the form of a decimal) of the root-mean-square speed of 238UF6 to that of 235UF6 at constant temperature is; 0.996.

According to the question;

By the formula for root mean square speed;

Root mean square speed is inversely proportional to the square root of the molar mass as evident in;

Therefore, the required ratio;

Therefore;

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8