Answer would be 21 electrons
B because it has a lower activation energy
<span>it is referred to as condensation. this is when a liquid is going from a gas to a liquid due to cooling
the opposit of this --turning a liquid to a gas-- is called vaporation when a liquid is heated up to the point it becomes steam</span>
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized