Question

As you move from left to right on the periodic table, (consider groups 1,2 and 13-18) how do numbers valence electrons change?
Answer
Shortest answer
Answer
How many valence electrons does an atom of selenium have? It is number 34 on the period table
Answer
An atom of aluminum loses 3 electrons due to ionic bonding. What is the charge of the aluminum ion?
Answered by GPT-4o mini
As you move from left to right across the periodic table within groups 1, 2, and 13-18, the number of valence electrons generally increases.

- In Group 1 (the alkali metals), elements have 1 valence electron.
- In Group 2 (the alkaline earth metals), elements have 2 valence electrons.
- In Group 13, elements have 3 valence electrons.
- In Group 14, elements have 4 valence electrons.
- In Group 15, elements have 5 valence electrons.
- In Group 16, elements have 6 valence electrons.
- In Group 17 (the halogens), elements have 7 valence electrons.
- In Group 18 (the noble gases), elements have 8 valence electrons (except for helium, which has 2).

Thus, as you move from left to right across these groups, the number of valence electrons increases by one for each group until you reach Group 18. This trend is important for understanding the reactivity and chemical behavior of the elements in these groups.
Answered by GPT-4o mini
Valence electrons increase by one as you move from left to right across groups 1, 2, and 13-18 on the periodic table.
Answered by GPT-4o mini
An atom of selenium (Se), which is number 34 on the periodic table, has 6 valence electrons. It is located in Group 16.
Answered by GPT-4o mini
When an atom of aluminum loses 3 electrons, it becomes an aluminum ion with a charge of \( +3 \). Thus, the charge of the aluminum ion is \( \text{Al}^{3+} \).