Q1: Number of electrons in the outermost orbit of a semi-conductor is

ANS:B - 4

In a semiconductor, the number of electrons in the outermost orbit can vary depending on the specific element or compound involved. However, most semiconductors commonly used in electronics are elements from groups 14 (such as silicon and germanium) and 15 (such as arsenic and phosphorus) of the periodic table.

1. Group 14 Semiconductors: Elements in group 14 of the periodic table, such as silicon (Si) and germanium (Ge), have four valence electrons in their outermost orbit.
2. Group 15 Semiconductors: Elements in group 15 of the periodic table, such as arsenic (As) and phosphorus (P), have five valence electrons in their outermost orbit.

The number of electrons in the outermost orbit determines the semiconductor's conductivity characteristics and its ability to participate in chemical bonding and electrical conduction. Therefore, the correct answer depends on the specific semiconductor material being referred to:

• For group 14 semiconductors (like silicon and germanium), the number of electrons in the outermost orbit is 4.
• For group 15 semiconductors (like arsenic and phosphorus), the number of electrons in the outermost orbit is 5.