A certain atom has atomic number Z = 21 and atomic mass number A = 44. (a) How m

Question

A certain atom has atomic number Z = 21 and atomic mass number A = 44.

(a) How many protons and neutrons are in the nucleus?

Number of protons = *
21 OK

Number of neutrons = *
23 OK

(b) What is the approximate radius of the nucleus of this atom?

rnucleus = m *
4.23e-15 OK

HELP: The approximate radius of the nucleus is related to the atomic mass number - check your text or notes to see how!

(c) What is the magnitude of the electrostatic force of repulsion between two protons on opposite sides of the diameter of the nucleus.

F = N ?????

Explanation / Answer

F = kq1q2/d2

q1 = q2 = 1.602*1019

k = 9*109

d = 2r = 2*4.23*10-15 = 8.46*10-15

F = (9*109*1.6022*10-38)/(8.462*10-30) = 3.228N

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