Question

1)

Consider two stable isotopes, helium-3 and helium-4. How many neutrons and protons are there in each isotope? What are the mass numbers?

Solution - Helium - 3 has 2 protons and 1 neutron. Mass number = 3

Helium - 4 has 2 protons and 2 neutrons . Mass number = 4

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2)

If two protons and two neutrons are added to the nucleus of a carbon atom, what nucleus does it become?

Solution - for carbon, atomic number = 6

atomic weight = proton number + neutron number = 6 + 6 = 12

so,

when we add 2 protons, atomic number = 8

when we add 2 protons and 2 neutrons, atomic weight = 16

it becomes an OXYGEN atom

Answer 1

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