Atoms

What is an isotope?

• Atoms of different elements that have the same number of neutrons.

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

• Atoms that have the same number of protons but different mass numbers.

• Atoms that are chemically identical but physically different.

What is the difference between an atom and a molecule?

• An atom is a single unit of an element, while a molecule is a group of two or more atoms bonded together.

• An atom is a group of two or more molecules, while a molecule is a single unit of an element.

• An atom can exist independently, while a molecule cannot exist independently.

• An atom is a type of molecule that contains only one element.

How are elements arranged in the modern periodic table?

• By atomic mass

• By atomic number

• By alphabetical order

• By density

What is the role of electrons in an atom?

• Electrons are involved in chemical bonding and reactions.

• Electrons are responsible for the mass of the atom.

• Electrons determine the color of the atom.

• Electrons are found in the nucleus of the atom.

What charge does an electron have?

• Positive charge

• Neutral charge

• Negative charge

• Variable charge

What charge does a neutron have?

• Positive charge

• Negative charge

• No charge (it is neutral)

• Variable charge

What charge does a proton have?

• Negative charge

• No charge

• Positive charge

• Neutral charge

What are the three main subatomic particles of an atom?

• Protons, neutrons, and electrons.

• Protons, electrons, and positrons.

• Neutrons, electrons, and neutrinos.

• Protons, muons, and quarks.

How many electrons does neon have in its outer shell?

• 6

• 7

• 8

• 10

What is a valence electron?

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

• Electrons that can participate in chemical bonding and are in the outermost shell of an atom.

• Electrons that are always positively charged.

• Electrons that do not participate in any chemical reactions.