Atom Review

What is the atomic number?

• The number of neutrons in an atom

• The number of electrons in an atom

• The number of protons in the nucleus of an atom

• The total number of particles in the nucleus of an atom

What are isotopes?

• Atoms of different elements with the same number of neutrons.

• Atoms of the same element that have different numbers of neutrons and different atomic masses.

• Atoms that have the same atomic mass but different chemical properties.

• Atoms that are unstable and emit radiation.

What is the periodic table?

• A chart that organizes all known elements by their atomic number and properties.

• A list of all known chemical reactions.

• A diagram showing the structure of an atom.

• A collection of all known compounds.

What is a molecule?

• A single atom that cannot bond with others.

• A group of two or more atoms bonded together.

• A type of chemical reaction involving atoms.

• A substance that cannot exist independently.

What is the difference between an element and a compound?

• An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

• An element can be broken down into simpler substances, while a compound cannot.

• An element is a mixture of different atoms, while a compound is a single type of atom.

• An element is always a solid, while a compound can be a solid, liquid, or gas.

What is the charge of an electron?

• A positive charge

• A neutral charge

• A negative charge

• A variable charge

What is the role of electrons in chemical bonding?

• Electrons are involved in forming bonds between atoms, allowing them to create molecules.

• Electrons are responsible for the color of the compounds.

• Electrons are only found in the nucleus of an atom.

• Electrons do not play a significant role in chemical reactions.

What are the three main parts of an atom?

• Protons, neutrons, and electrons

• Protons, electrons, and positrons

• Neutrons, electrons, and quarks

• Protons, muons, and neutrinos

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

• Number of neutrons = Mass number - Atomic number.

• Number of neutrons = Atomic number + Mass number.

• Number of neutrons = Mass number / Atomic number.

• Number of neutrons = Mass number - 2 x Atomic number.

What is a valence electron?

• Electrons that are in the innermost shell of an atom.

• Electrons that are involved in chemical bonding and are located in the outermost shell of an atom.

• Electrons that have a negative charge and are found in the nucleus of an atom.

• Electrons that are responsible for the mass of an atom.