Question
Asked Sep 27, 2019
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How many electrons would it take to equal the mass of a helium nucleus?

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Expert Answer

Step 1

The helium atom has 2 protons, 2 neutrons and 2 electrons. The mass of helium nucleus depends only on 2 protons and 2 neutrons. The mass of proton(mp) is 1.673×10-27 kg and the mass of neutron (me)is 1.675 ×10-27 kg. The total mass of nucleus  (mHe) is calculated below.

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- 2(m,) 2(m) -2( 1.673 x1027 kg) 2(1.675 x 1027 kg ) m He + 1027 kg 3.346 x1027 kg + 3.350 x = 6.696 x 1027 kg

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Step 2

An electron has a mass (me) of 9.1 ×10-31 kg. The number of electrons (ne)that are equal to the mass of Helium (mHe) is calculated by divi...

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m He 6.696 x 1027 kg 9.1 x 1031kg 7358.24 =7358

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