U1 Review Atomic Structure - Practice Questions

What is the mass number of a sodium (Na) atom that has 12 neutrons?

• 10

• 11

• 12

• 23

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

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NGSS.MS-PS1-1

Which statement accurately describes the atoms of a specific element?

• An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus

• A zinc, Zn atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

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Atoms of which 2 elements have a combined total of 11 protons?

• Nitrogen, N, and Chlorine, Cl

• Boron, B, and Carbon, C

• Copper, Cu, and Zinc, Zn

• Helium, H, and Neon, Ne

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In the early 1900’s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with--

• Protons orbiting a dense nucleus made of electrons and neutrons

• Electrons orbiting a dense nucleus made of protons and neutrons

• Neutrons orbiting and protons orbiting a cloud of electrons

• Electrons orbiting and protons orbiting a cloud of neutrons

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What types of particles are found in the cloud surrounding the atom’s nucleus?

• Positively charged particles and negatively charged particles

• Negatively charged particles only

• Neutral particles and positive charged particles

• Positively charged particles only.

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Which of the following is the mass number of the atom represented in the above graphic?

• 17

• 16

• 33

• 32

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An atom has 11 protons, 12 neutrons, and 11 electrons. What is the charge of the atom’s nucleus?

• +11

• +12

• -12

• -11

According to the Periodic Table, which of the following is the most accurate model of an atom of boron?

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Which of the atoms below has the lowest mass number

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