Atomic Concepts Review

The results of the gold foil experiment led to the conclusion that an atom is

• mostly empty space and has a small, negatively charged nucleus

• mostly empty space and has a small, positively charged nucleus

• a hard sphere and has a large, negatively charged nucleus

• a hard sphere and has a large, positively charged nucleus

Which notations represent atoms that are isotopes of each other?

• C-14 and N-14

• O-16 and O-18

• I-131 and I-131

• Rn-222 and Ra-222

An excited potassium atom releases a specific amount of energy when one of its electrons moves from

• the first shell to the fourth shell

• the second shell to the fourth shell

• the fourth shell to the fifth shell

• the fourth shell to the second shell

The characteristic bright-line spectrum of an atom is produced when

• nuclei undergo fission

• nuclei undergo fusion

• electrons move from higher to lower energy levels

• electrons move from lower to higher energy levels

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Identify the elements in the unknown mixture using their unique bright-line spectra.

• Lithium and cadmium are in the mixture. Strontium is not in the mixture.

• Lithium and strontium are in the mixture. Cadmium is not in the mixture

• Cadmium and strontium are in the mixture. Lithium is not in the mixture

• All of the shown elements are present in the mixture.

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Which electron configuration represents an atom of Aluminum in the ground state?

• 2-8

• 2-8-3

• 2-8-6

• 2-11

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Which statement describes the location of two types of subatomic particles in an atom of helium?

• Protons and neutrons are located in the nucleus

• Protons and neutrons are located outside the nucleus

• Protons and electrons are located in the nucleus

• Protons and electrons are located outside the nucleus

Which statement describes the structure of an atom?

• The nucleus contains positively charged electrons

• The nucleus contains negatively charged protons

• The nucleus has a positive charge and is surrounded by negatively charged electrons

• The nucleus has a negative charge and is surrounded by positively charged electrons

An atom of Argon-42 contains

• 24 electrons, 24 protons, and 42 neutrons

• 24 electrons, 24 protons, and 24 neutrons

• 18 electrons, 18 protons, and 42 neutrons

• 18 electrons, 18 protons, and 24 neutrons

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NGSS.MS-PS1-1

What is the approximate mass of an atom that has 10 protons, 10 electrons, and 9 neutrons?

• 10 u

• 19 u

• 20 u

• 29 u

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