chemistry

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When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of gold atom consists of

A. Neutrons
B. Protons
C. Deuterons
D. Unoccupied space

15. When an alpha particle is emitted by an atom, the atomic number of the atom will

A. Decrease by 2
B. Increase by 2
C. Decrease by 4
D. Increase by 4

16. Which of the following element has the corresponding valence subshell of 3p4? Atomic numbers are listed next to the elements.

A. Aluminum 13
B. Silicon 14
C. Sulfur 16
D. Chlorine 17