Question

1. which element is the most reactive in the...

a. alkali metals?

b. alkaline earth metals?

c. halogens?

1. noble gases are not reactive. explain why.

part 3
drawing lewis dot structures

tures are models we use to show the number of valence electrons an atom has. a dot repres

Explanation:

Question 21 (assuming the context is about groups in the periodic table, but the question is cut off; let's address Question 22 first)

Question 22: Noble gases are not reactive. Explain why.

Noble gases (like He, Ne, Ar) have a full valence electron shell (octet, except He with 2 electrons). A full valence shell means they have no tendency to gain, lose, or share electrons to achieve stability, so they rarely react.

Alkali metals are in Group 1 of the periodic table (Li, Na, K, Rb, Cs, Fr). They have 1 valence electron, are highly reactive, and form +1 ions.

Alkaline earth metals are in Group 2 (Be, Mg, Ca, Sr, Ba, Ra). They have 2 valence electrons and form +2 ions.

Answer:

Noble gases have a full valence electron shell (e.g., octet configuration, or 2 electrons for He). This stable electron arrangement means they do not need to gain, lose, or share electrons to achieve stability, so they are chemically unreactive.

For Question 21 (incomplete, but if we assume it's about identifying elements in groups):

Assuming sub - questions (a) alkali metals, (b) alkaline earth metals, (c) halogens:

(a) Alkali metals: