To determine the number of valence electrons for Beryllium (Be) using the provided information and the periodic table, follow these steps:
1. Understanding Valence Electrons:
- Valence electrons are the electrons located in the outermost shell of an atom. These electrons play a key role in chemical reactions and bonding.
2. Referencing Period 2 Elements:
- The elements listed in the table belong to period 2 of the periodic table which includes elements from Lithium (Li) to Neon (Ne).
3. Nbumber of Valence Electrons for Period 2 Elements:
- Lithium (Li) is in group 1 and has 1 valence electron.
- Beryllium (Be) is in group 2.
- Boron (B) is in group 13 and has 3 valence electrons.
- Carbon (C) is in group 14, typically has 4 valence electrons but it's not provided explicitly here.
- Nitrogen (N) is in group 15 and has 5 valence electrons.
4. Determining Valence Electrons by Group Number:
- Elements in group 1 have 1 valence electron.
- Elements in group 2 have 2 valence electrons.
- Elements in group 13 have 3 valence electrons.
- The trend continues similarly as you move across the groups from 1 to 18.
5. Position of Beryllium in the Periodic Table:
- Beryllium is in group 2 of the periodic table.
6. Conclusion:
- Since Beryllium (Be) is in group 2, it has 2 valence electrons.
Therefore, the number of valence electrons for Beryllium (Be) is [tex]\(2\)[/tex].
Answer: A. 2
