Atomic Structure and Theory

What is the mass number of an atom?

• The total number of electrons in an atom.

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

• The total number of protons in an atom.

• The total number of neutrons in an atom.

What are electrons?

• Negatively charged subatomic particles that orbit the nucleus of an atom.

• Positively charged particles found in the nucleus of an atom.

• Neutral particles that exist in the nucleus of an atom.

• Particles that are responsible for the chemical bonding between atoms.

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

• Add the atomic number and the mass number.

• Multiply the atomic number by the mass number.

• Subtract the atomic number from the mass number.

• Divide the mass number by the atomic number.

What is the nucleus of an atom?

• The outer shell of an atom that contains electrons.

• The central part of an atom, containing protons and neutrons.

• A type of particle that orbits around the nucleus.

• The energy level of an atom.

What is the significance of the periodic table?

• It organizes elements based on their atomic number and properties, providing a useful reference for understanding chemical behavior.

• It lists all known elements in alphabetical order for easy reference.

• It categorizes elements based on their color and physical appearance.

• It provides a historical timeline of the discovery of elements.

What are isotopes?

• Variants of different elements with the same number of protons

• Variants of the same element that have the same number of protons but different numbers of neutrons

• Elements that have the same number of neutrons but different numbers of protons

• Elements that are chemically identical but have different atomic masses

What are neutrons?

• Subatomic particles with a positive charge found in the nucleus of an atom.

• Neutral subatomic particles found in the nucleus of an atom.

• Particles that orbit the nucleus of an atom and have no charge.

• Negatively charged particles that are found in the nucleus of an atom.

What determines the chemical properties of an element?

• The number and arrangement of its electrons.

• The atomic mass of the element.

• The temperature at which it is found.

• The color of the element.

What are protons?

• Negatively charged particles found in the nucleus of an atom.

• Positively charged subatomic particles found in the nucleus of an atom.

• Neutral particles that orbit the nucleus of an atom.

• Particles that are found outside the nucleus of an atom.

What is the atomic number of an element?

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

• The number of protons in the nucleus of an atom, which determines the element's identity.

• The total number of electrons in an atom.

• The mass of an atom measured in atomic mass units.