AP Chemistry : Atoms
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Example Questions
Example Question #14 : Elements, Ions, And Isotopes
Which of the following is not a subatomic particle?
Protons, neutrons, and electrons are all subatomic particles. Alpha particles consist of 2 protons and 2 neutrons bound together in a particle. It is usually emitted during fission reactions.
Example Question #1 : Atoms
Which of the following statements is true?
Electrons are close in proximity to the atomic nucleus
Electrons are larger than protons, which means they must have less charge than protons
The nucleus of an atom is electrically neutral
Electrons are smaller in size than nucleons, but have equal charge
Electrons are smaller than protons, which means they have less charge than protons
Electrons are smaller in size than nucleons, but have equal charge
Electrons are notably smaller than nucleons (protons and neutrons), however, they have an equal amount of charge to protons. This is why an atom with the same amount of protons as electrons is considered electrically neutral.
The nucleus itself is positively charged, as the electrons are located relatively far away from the atomic center.
Example Question #2 : Atoms
What is the sum of the number of neutrons of the following atoms: (a) N15
(b) Ag109 (c) Si30
90
84
82
88
86
86
In an atomic representation, the number of neutrons and protons is the upper number
and the number of protons is the lower number. If only one number is given, we can assume
that the number of protons is its atomic number. Therefore (a) 7 protons and 8 neutrons
(b) 47 protons and 62 neutrons (c) 14 protons and 16 neutrons. The total number is 86.
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