Many elements that are essential for life, including nitrogen, oxygen, and carbon, are part of what classification? Group of answer choices

noble gases

nonmetals

metalloids

metals

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer