Solid State Devices 1 (PinoyBix)

Question 1

How many electrons are there in the fourth orbit of a copper atom?
A. 1
B. 2
C. 3
D. 4

Answer 1

A.
Atomic Number of Copper is 29. 1st orbit has 2 electrons, 2nd has 8, 3rd has 18. 2+8+18 = 28. 1 electron in the 4th orbit.

Question 2

The maximum permissible number of electrons in the third orbit is?
A. 18
B. 8
C. 32
D. 2

Answer 2

A. 1st = 2, 2nd = 8, 3rd = 18, 4th = 32, 5th = 50