Understanding Atoms and Isotopes Review

What is the basic unit of matter that retains the properties of an element?

• Molecule

• Atom

• Compound

• Ion

Which subatomic particle determines the identity of an atom?

• Electron

• Neutron

• Proton

• Nucleus

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NGSS.HS-PS1-8

What does the atomic number of an element represent?

• Number of neutrons

• Number of protons

• Number of electrons and neutrons

• Mass number

Where are electrons located in an atom?

• Nucleus

• Electron cloud

• Proton shell

• Neutron core

What is an isotope?

• An atom with a different number of protons

• An atom with a different number of electrons

• Atoms of the same element with different numbers of neutrons

• Atoms of different elements with the same number of protons

How do you determine the number of neutrons in an atom?

• Subtract the atomic number from the mass number

• Add the number of protons and electrons

• Subtract the number of electrons from the mass number

• Add the atomic number and mass number

Which of the following is the correct isotopic symbol for an atom with 8 protons, 9 neutrons, and 8 electrons?

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NGSS.MS-PS1-1

Write the correct isotopic symbol for Chlorine-37.

A neutral atom of magnesium has an atomic number of 12 and a mass number of 24. How many protons, neutrons, and electrons does it have?

• 12 protons, 12 neutrons, 12 electrons

• 12 protons, 24 neutrons, 12 electrons

• 24 protons, 12 neutrons, 12 electrons

• 12 protons, 12 neutrons, 24 electrons

Tags

NGSS.MS-PS1-1

• 3 protons, 4 neutrons, 3 electrons

• 4 protons, 3 neutrons, 4 electrons

• 7 protons, 3 neutrons, 7 electrons

• 3 protons, 7 neutrons, 3 electrons

Tags

NGSS.MS-PS1-1