Because noble gases has full of 8 electron in her external cell......
I don't understand what you are looking for. I can tell you that the speed of molecules does change during state changing.
The best and most correct answer among the choices provided by your question is the second choice or letter B.
<span>When the switch is closed, the current instantaneously becomes 1.</span>
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The object that goes through chemical change, changes completely to where you can not change it back to its original form. Physical change you can undo
