<u>Moseley</u> discovered that <u>elements</u> with similar properties occurred at <u>regular intervals</u> when the elements were arranged in order of increasing
<u>"</u><u> </u><u>Atomic number </u><u>"</u>
Answer:
A. since Nitrogen has 7 electrons and when it gains 3 electrons it will have 10 electrons. using short hand rule it is [Ne]
Two atoms of different elements that are chemically combined are called compounds.
From Graham's law of diffusion the effusion rate of a gas is inversely proportional to the square root of its molar mass.
Therefore for helium and radon; Helium has a mass of 4 g while randon has 222, hence;
= √222/√4
= 14.90/2
= 7.45
Thus the ratio of effusion rate between helium and randon is 7.45