To determine the number of valence electrons in each atom of arsenic (As), we need to consider its location in the periodic table. Here are the steps:
1. Locate the Element: Arsenic (As) is element number 33. It is situated in period 4 and group 15 of the periodic table.
2. Group Number and Valence Electrons: Elements in the same group (vertical column) of the periodic table share similar chemical properties and have the same number of valence electrons. Arsenic is in group 15 (which can also be referred to as group 5A in older notations).
3. Valence Electrons in Group 15: The elements in group 15 (the Nitrogen family) have 5 valence electrons.
Therefore, each atom of arsenic (As) has 5 valence electrons.
The correct answer is:
5
