Exploring Atoms and Molecules

What are the three main subatomic particles of an atom?

• Protons, Photons, Neutrons

• Electrons, Neutrons, Positrons

• Protons, Neutrons, Muons

• Protons, Neutrons, Electrons

Describe the structure of an atom.

• An atom is a single particle that cannot be divided into smaller parts.

• An atom is structured with a central nucleus containing protons and neutrons, surrounded by electrons in orbitals.

• An atom consists of a solid core made of electrons and a cloud of protons.

• Atoms are made up entirely of neutrons with no other particles present.

Who proposed the first atomic model?

• John Dalton

• Albert Einstein

• Erwin Schrödinger

• Niels Bohr

What is the main difference between the Rutherford and Bohr models of the atom?

• The Rutherford model describes electrons as particles in fixed positions.

• The Bohr model suggests that atoms are indivisible and cannot be split.

• The Bohr model includes quantized electron orbits, while the Rutherford model does not.

• The Rutherford model includes electron clouds around the nucleus.

What is an ion? How is it formed?

• An ion is a type of atom that cannot gain or lose electrons.

• An ion is a neutral particle formed by the combination of protons and neutrons.

• An ion is a charged particle formed by the fusion of two atoms.

• An ion is a charged particle formed by the loss or gain of electrons.

How do you calculate the mass number of an atom?

• The mass number is the average weight of all isotopes of an element.

• The mass number of an atom is the sum of its protons and neutrons.

• The mass number is the number of electrons in an atom.

• The mass number is the total number of chemical bonds in an atom.

What is the chemical formula for water?

• CO2

• H2O

• H2O2

• NaCl

How do isotopes of the same element differ from each other?

• Isotopes differ in the number of protons and chemical properties.

• Isotopes have the same number of neutrons and different atomic numbers.

• Isotopes are identical in mass but differ in charge.

• Isotopes differ in the number of neutrons and atomic mass.

What is the charge of a neutron?

• +1

• 0

• -1

• +2

How can you determine the number of protons in an atom?

• Protons can be counted by measuring the mass of the atom.

• The number of protons is determined by the number of electrons.

• The number of protons in an atom is equal to its atomic number.

• The number of protons is equal to the number of neutrons.