Atomic Theory and Atomic Structure

What is the difference between an atom and a molecule?

• An atom is the smallest 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 without an atom.

• An atom is larger than a molecule, which is made up of smaller particles.

What is the atomic number of Argon?

• 16 protons

• 18 protons

• 20 protons

• 14 protons

What is the charge of a proton?

• Negative

• Neutral

• Positive

• Variable

What is the periodic table?

• A tabular arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties.

• A graphical representation of chemical reactions.

• A list of all known elements in alphabetical order.

• A collection of isotopes of various elements.

In a negative ion like O^-2, do you have more protons or electrons?

• More protons

• More electrons

• Equal number of protons and electrons

• No protons, only electrons

What is the mass number of an atom?

• The total number of protons and neutrons in the nucleus

• The total number of electrons in the atom

• The number of protons only

• The number of neutrons only

Proposed the Modern Electron Cloud Model of the atom

• Schrodinger & Heisenberg

• Niels Bohr

• Erwin Schrödinger

• Albert Einstein

What is the role of electrons in chemical bonding?

• Electrons in the outer shell (valence electrons) are involved in bonding.

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

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

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

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Electrically Charged

What is the charge of an electron?

• Positive

• Neutral

• Negative

• Variable