Answer:
Xe
Explanation:
Cs and Na are solids in room temperature while F and Xe are gases.
The number of electrons in the outermost shell of an atom will determine its reactivity. Out of the gases given Xe and F, F ( the most electronegative element) posses 5 valence shell electrons which makes it highly reactive while Xe which is a noble gas posses 8 valence shell electrons which makes it less reactive compared to many elements.
creo que es cuandoooo nah mentiras no se xd
Well in reality driverless cars are safer than human drivers because they have no thoughts of a human driver or be affected by alcohol or smoke. Also less human lives are at risk when driving the car.
The wilderness act of 1964 established the national wilderness preservation system and in it. Your answer is C