Intro to Atoms Review Chp 3.1

What is an atom?

• An atom is the basic unit of matter.

• An atom is a type of animal.

• An atom is a unit of time.

• An atom is a type of fruit.

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NGSS.MS-PS1-1

What are the three subatomic particles that make up an atom?

• protons, neutrons, and quarks

• protons, electrons, and photons

• protons, neutrons, and electrons

• protons, neutrons, and positrons

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NGSS.MS-PS1-1

What is the charge of a proton?

• 0

• -1

• +2

• +1

What is the charge of a neutron?

• 0

• -1

• 2

• 1

What is the atomic number of an atom?

• The atomic number of an atom is the number of protons and neutrons in the nucleus of the atom.

• The atomic number of an atom is the number of protons in the nucleus of the atom.

• The atomic number of an atom is the number of neutrons in the nucleus of the atom.

• The atomic number of an atom is the number of electrons in the nucleus of the atom.

What is the atomic mass of an atom?

• The atomic mass of an atom is the total number of protons and neutrons in the nucleus.

• The atomic mass of an atom is the average mass of all the isotopes of that element, taking into account their relative abundance.

• The atomic mass of an atom is the average mass of all the electrons in that element.

• The atomic mass of an atom is the sum of the masses of all the isotopes of that element.

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Scientists use ​ (a)   to study ​ (b)   because they are so ​ (c)  

• models
• atoms
• small
• plastic

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Which two particles are found in an atom's nucleus?

• electrons

• protons

• neutrons

• nucleui

Which two particles in an atom are in equal number?

• protons

• neutrons

• electrons

• Bohr's Particles

How are elements identified in terms of their atoms?

• by the number of electrons in the nucleus

• by the number of neutrons in the nucleus

• by the number of protons in the nucleus