Question

2.8,7 What is the mass of an element with an electron structure?
 

Answer 1

Answer:

As the electronic configuration of the givenatom is 2,8,7 it is inferred that the atomic number of element is 17 (2+8+7). Thuselement with atomic number 17 is Chlorine. Among the options given which includes Nitrogen, Fluorine, Phosphorus and Argon, chlorine is chemically similar to fluorine.

Answer 2

Answer:

❥Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit. Therefore, they do not contribute much to an element's overall atomic mass