Exploring the Structure of Atoms

Who proposed the first atomic theory?

• Albert Einstein

• Niels Bohr

• John Dalton

• Erwin Schrödinger

What is the main idea of Dalton's atomic theory?

• All matter is composed of molecules that can be divided.

• Atoms of different elements are identical in size and mass.

• Matter is made up of energy rather than atoms.

• Matter is made up of indivisible atoms, and each element has unique atoms.

Which scientist discovered the electron?

• J.J. Thomson

• Niels Bohr

• Isaac Newton

• Albert Einstein

What does the quantum mechanical model of the atom describe?

• The behavior of electrons in atoms as wave functions and their probabilistic locations.

• The exact positions of electrons at any given time.

• The chemical properties of elements based on their atomic mass.

• The fixed paths of electrons around the nucleus.

How many electrons can the first energy level hold?

• 1

• 2

• 8

• 4

What is the electron configuration for carbon?

• 1s² 2s¹ 2p³

• 1s² 2s² 2p¹

• 1s² 2s² 2p²

• 1s² 2s² 2p⁴

What is the maximum number of electrons in the second energy level?

• 10

• 8

• 4

• 2

Define isotopes.

• Isotopes are variants of a chemical element with the same number of protons but different numbers of neutrons.

• Isotopes are atoms that have different chemical properties due to varying electron counts.

• Isotopes are identical atoms that differ only in their atomic mass.

• Isotopes are elements with the same number of neutrons but different protons.

How do isotopes of an element differ from each other?

• Isotopes differ in the number of protons and electrons.

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

• Isotopes have the same atomic mass but different chemical properties.

• Isotopes are different elements with unique atomic numbers.

What is an ion?

• A molecule that contains only nonmetals.

• An ion is a charged atom or molecule.

• A type of chemical bond between atoms.

• A neutral atom with no charge.