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The table shows a list of Period 2 elements. Determine the number of valence electrons for Beryllium (Be).

\begin{tabular}{|l|l|}
\hline Element & Number of Valence Electrons \\
\hline Li & 1 \\
\hline Be & \\
\hline B & 3 \\
\hline C & \\
\hline N & \\
\hline
\end{tabular}

A. 2
B. 1
C. 4
D. 3

Sagot :

GinnyAnsweridn
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
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