Exploring Atomic Structure and Properties

Which subatomic particle is found in the nucleus of an atom and has a positive charge?

• Electron

• Proton

• Neutron

• Positron

Tags

NGSS.HS-PS1-8

Explain why isotopes of the same element have different mass numbers but the same chemical properties.

• Isotopes have different numbers of protons.

• Isotopes have different numbers of neutrons.

• Isotopes have different numbers of electrons.

• Isotopes have different atomic numbers.

Tags

NGSS.HS-PS1-8

Which of the following best describes the electron cloud model of the atom?

• Electrons orbit the nucleus in fixed paths.

• Electrons are found in specific energy levels.

• Electrons are located in a cloud around the nucleus.

• Electrons are embedded in a positive sphere.

Calculate the number of neutrons in an atom of carbon-14.

• 6

• 8

• 14

• 12

How does the Bohr model of the atom differ from the quantum mechanical model?

• The Bohr model describes electrons in fixed orbits, while the quantum model describes electron probabilities.

• The Bohr model includes neutrons, while the quantum model does not.

• The Bohr model is based on wave functions, while the quantum model is not.

• The Bohr model describes the nucleus, while the quantum model does not.

Which of the following elements has an atomic number of 8?

• Nitrogen

• Oxygen

• Fluorine

• Neon

Predict the effect on the atomic number and mass number when a neutron is added to an atom.

• The atomic number increases by 1, and the mass number remains the same.

• The atomic number remains the same, and the mass number increases by 1.

• Both the atomic number and mass number increase by 1.

• The atomic number decreases by 1, and the mass number increases by 1.

What is the charge of an electron?

• Positive

• Negative

• Neutral

• Variable

Describe how the periodic table is organized in terms of atomic structure.

• By increasing atomic mass

• By increasing atomic number

• By decreasing atomic number

• By decreasing atomic mass

Tags

NGSS.HS-PS1-1

Which of the following particles has the least mass?

• Proton

• Neutron

• Electron

• Alpha particle