Sodium (Na) is very reactive because it does not have a full valence shell.
Group 17 is the second column from the right in the periodic table and contains six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (As), and (Ts). Astatine and are radioactive elements with very short half-lives and thus do not occur naturally.
Answer:
because it is from a mathematical combination of SI base units
Explanation:
Compound machines have two or more simple machines
Explanation:
a chip on your shoulder is an example