Question

In the nucleus of an atom, there are 18 protons and 20 neutrons. What are the atomic number and mass number of this isotope? (2 points)

Answer 1

Study the electron dot diagrams for lithium, carbon, fluorine, and neon in Figure 1.
18.
Choose the statement that correctly identifies the most stable of the elements. (1 point)

Lithium is the most stable element because it has to lose only one electron to achieve a stable configuration.
Carbon is the most stable element because it can form four bonds.
Fluorine is the most stable element because it has to gain only one electron to achieve a stable configuration.
Neon is the most stable element because its highest occupied energy level is filled.