1. -1 points CJ10 18 P001 My Notes ASK Your Teache Iron atoms have been detected

Question

1. -1 points CJ10 18 P001 My Notes ASK Your Teache Iron atoms have been detected in the sun's outer atmosphere, some with many of their electrons stripped away. What is the net electric charge (in coulombs) of an iron atom with 26 protons and 9 electrons? Be sure to include the algebraic sign (+ or-) in your answer. Additional Materials LO Section 18.4 2 -1 points C110 18 P002 My Notes O Ask Your Teache An object has a charge of -2.4 JC. How many electrons must be removed so that the charge becomes +2.0 C? electrons Additional Materials Section 18.4

Explanation / Answer

1] Net charge = sum of all positive charges + sum of all negative charges

Q = e[26 - 9] = + 16e = 16 x 1.6 x 10-19 = 2.56 x 10-18 C

2] change in the charge = 0.4 x 10-6 C

so, 0.4 x 10-6 = ne

=> n = 2.5 x 1012

this is the number of electron which must be removed to get the final charge as 2x10-6 C.

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