Question

which family of elements has exactly one valence electron and is highly reactive with water? * 1 point
noble gases
halogens
alkali metals
alkaline earth metals
what is the atomic weight of potassium? * 1 point
40
29
39
50

Explanation:

First Question (Atomic Weight of Potassium)

Step1: Recall Potassium's Atomic Weight

Potassium (K) has an atomic weight of approximately 39.10, but from the given options (40, 29, 39, 50), the closest and most accurate choice among them is 39 (considering possible rounding or simplified values for the question).

Alkali Metals (Group 1 elements) have exactly one valence electron and are highly reactive with water (e.g., Li, Na, K react vigorously with water). Noble Gases are inert, Halogens have 7 valence electrons, and Alkaline Earth Metals have 2 valence electrons.

Answer:

39

Second Question (Element Family)