Ch.4 8th Grade(Study Guide)

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Dot diagrams are used to represent

Outer electrons `

If an isotope has an atomic number of 25, which of the following is most likely to be its mass number ?

50

The particles that make up an atom are

Protons, neutrons,and nuclei

In an atom, electrons

Travel outside the nucleus

A certain atom has 26 protons,26 electrons,and 30 neutrons.It mass number is ?

56

Which type of particle would NOT be deflected by a magnetic field ?

Neutron

The maximum number of electrons is the second energy level of an atom is ?

Eight

Which item best represents Thomson's mental image of an atom ?

A chocolate-chip cookie

Which of the following properties

Air

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