Science Review Unit 1

If an atom has 12 protons, 13 neutrons, and 12 electrons, what is the charge of the atom?

• +1

• 0

• -1

• +2

Which statement best describes the nucleus of an atom?

• It is a centrally located structure comprosing almost all of the atomic mass and having an overall neutral charge.

• It is a centrally located structure comprisng almost none of the atomic mass and having an overall positive charge.

• It is located in the electron cloud, comprises almost all of the atomic mass, and has a positive charge.

• It is a centrally located structure comprising almost of the atomic mass and having an overall positive charge.

Which model below is the best representation of the atomic structure of a lithium atom?

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Tags

NGSS.MS-PS1-1

An element has 27 protons, 27 electrons, and 32 neutrons. Calculate the atomic mass of this element.

• 52

• 59

• 54

• 51

A group of students examines Bohr structure diagrams of various atoms and a Periodic Table. Which hypothesis can be formulated based on observations of the Bohr models and the Periodic Table?

• Elements within the same period on the Period Table have similar properties.

• The atomic mass of an atom is determined by the number of protons and neutrons.

• The valance number of an atom determines the density of the atom.

• The atomic number of an atom is determined by the number of neutrons.

Groups of students built models of atoms using macaroni to represent protons, beans to represent neutrons, and marshmallows to represent electrons. Which improvement would more accurately portray the actual size of each suatomic particle.

• Use three different colors of marshmallows to represent the subatomic particles in the model.

• Use only lima beans, draw a plus sign on the lima beans that represent protons, a 0 on the lima beans that represent neutrons, and a negative sign on the lima beans that represent the electrons

• Use rice grains to represent electrons in the model

• Use cotton balls to represent electrons in the model

Tags

NGSS.MS-PS1-1

An electron is approximately 0.05% of the mass of a proton. Protons and neutrons each have a mass of 1 amu. Which of the following best describes the relationship between mass and subatomic particles?

• The mass of an electron is equal to that of a neutron.

• Atomic mass is the total number of protons and electrons.

• A neutron has 0.05% more mass than an electron.

• The nucleus comprises over 99% of the atom's mass.

A student is given a diagram of an atom with 3 protons and 3 electrons. Which statement describes the atom if another electron is added to the diagram?

• The atomic number will increase by 1.

• The atomic mass will increase by 1.

• The atomic number will decrease by 1.

• The atomic number will stay the same and the atom will become negatively charged.

Tags

NGSS.MS-PS1-1

Which subatomic particles make up the mass of an atom?

• 1 only

• 1 and 3 only

• 3 only

• 2 and 3 only

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NGSS.MS-PS1-1

Which subatomic particle is attracted to the nucleus?

• proton

• neutron

• electron

• none of the above