Question

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Answer 1

g) The subatomic particles that determine the mass of an atom are the proton and the neutron.

h) Democritus

i) 8 valence electrons

j) 10

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Answer 2

Answer:

helllllooooo !!!!!

Explanation:

• neutron and proton

• J.J.Thomsan

• 8 elctrons {as chlorine gained one..n became chloride ION }

• n =A-Z

=19-9 =10

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