For which elements in groups 1A, 2A, 5A, and 7A of the periodic table does the first letter of their symbol differ from the first letter of their name?

Verified step by step guidance

1. Step 1: Identify the groups in the periodic table: Group 1A (alkali metals), Group 2A (alkaline earth metals), Group 5A (pnictogens), and Group 7A (halogens).
2. Step 2: List the elements in each group: Group 1A includes elements like Lithium (Li), Sodium (Na), etc.; Group 2A includes Beryllium (Be), Magnesium (Mg), etc.; Group 5A includes Nitrogen (N), Phosphorus (P), etc.; Group 7A includes Fluorine (F), Chlorine (Cl), etc.
3. Step 3: For each element in these groups, compare the first letter of the element's name with the first letter of its chemical symbol.
4. Step 4: Identify elements where the first letter of the symbol is different from the first letter of the name. For example, Sodium (Na) in Group 1A has a symbol that starts with 'N' while the name starts with 'S'.
5. Step 5: Compile a list of such elements from each group where this discrepancy occurs.