Question

which group of elements is known to react violently with water and give up their lone valence electron?
alkali metals
noble gases
alkaline earth metals
halogens
10 multiple choice 1 point
the lewis valence dot electron structures are used to illustrate the number of valence electrons of atoms of representative elements. considering this, use the periodic table to predict the number of \dots\ that should be drawn around antimony (sb) to represent its lewis dot structure.
8
6
2
5

Explanation:

• Alkali Metals (Group 1 elements) have one valence electron. They react violently with water. For example, sodium (\(Na\)) reacts with water (\(H_2O\)) to form sodium hydroxide (\(NaOH\)) and hydrogen gas (\(H_2\)). The reaction is highly exothermic.
• Antimony (\(Sb\)) is in Group 15 of the periodic table. The number of valence electrons for Group 15 elements is \(5\). In Lewis dot structures, the number of dots represents the number of valence electrons.

Answer:

• First question: Alkali Metals
• Second question: 5