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1. Which statement about subatomic particles is NOT true? (1 point)

Protons and neutrons have almost the same mass.
Protons and electrons have opposite charges.

Unlike protons and electrons, neutrons have no charge.

Protons and neutrons have the same charge.

2. Which of the following is unique for any given element? (1 point)

the number of neutrons

the charge on the electrons

the number of protons

the mass of a neutron

3. Suppose an atom has a mass number of 35. Which statement is true beyond any doubt? (1 point)

The atom has an odd number of neutrons.

The atomic number is less than 17.

The atom is not an isotope.

The number of protons in the nucleus
does not equal the number of neutrons.

5. In Rutherford’s gold foil experiment, some of the____________________aimed at gold atoms bounced back, suggesting that a solid mass was at the center of the atom. (1 point)

6. Neutrons and_______________have almost the same mass. (1 point)

7. Which of the three subatomic particles—proton, electron, or neutron—has the least mass? (1 point)

8. If an atom has 32 protons and 38 neutrons, what is its mass number? (1 point)

9. Most calcium atoms have an atomic number of 20 and a mass number of 40, but some calcium atoms have a mass number of 48. What word could you use to describe these two kinds of calcium atoms? (1 point)

10. In the nucleus of an atom, there are 15 protons and 16 neutrons. What is the atomic number of this isotope? (1 point)

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