How does the connotation of the word perilous affect the tone

What would be the mass of an atom with 8 protons and 8 neutrons? a) 16 amu b) 8 amu c) 64 amu

Can someone tell me what these symbols mean or what does it say

Which statement would you identify as being correct? it is important to learn the etymology of every word in a text. it is important to understand the etymology of every word in a text. it is important to study the etymology of every word in a text. it is important to study the etymology of some words in a text.