AP Chemistry: Introduction to the Atom

Questions and Answers

What is the atomic number?

The number of protons in a nucleus

Both B and C (correct)

The number of electrons in a neutral atom

The number of neutrons in a nucleus

What are isotopes?

Atoms of a single element that differ in the number of neutrons in their nuclei.

What is protium?

Hydrogen-1, the most common hydrogen isotope.

What is deuterium?

Hydrogen-2, an isotope of hydrogen with 1 neutron in the nucleus. Signup and view all the answers

What is tritium?

Hydrogen-3, an isotope of hydrogen with 2 neutrons in the nucleus. Signup and view all the answers

What are elements?

Atoms of the same type. Signup and view all the answers

What is an atom?

The smallest particle of an element. Signup and view all the answers

What is a proton?

A subatomic particle in the nucleus that defines an element. Signup and view all the answers

What is an electron?

A subatomic particle that has a negative charge. Signup and view all the answers

What is a neutron?

A subatomic particle that has no charge and is found in the nucleus. Signup and view all the answers

What is average atomic mass?

The weighted average of the atomic masses of the naturally occurring isotopes of an element. Signup and view all the answers

What is an atomic mass unit?

1.660540 x 10^-27 kg. Signup and view all the answers

What is Avogadro's number?

6.02214076 x 10^23. Signup and view all the answers

What is a mole?

6.02214076 x 10^23 atoms of an element. Signup and view all the answers

Study Notes

Atomic Structure Fundamentals

Atomic Number: Represents the number of protons in the nucleus and equals the number of electrons in a neutral atom.
Isotopes: Variants of a single element that possess the same atomic number but have different numbers of neutrons, resulting in different masses.

Hydrogen Isotopes

Protium: The most prevalent isotope of hydrogen, designated as Hydrogen-1.
Deuterium: Also known as Hydrogen-2, contains one neutron in its nucleus, distinguishing it from Protium.
Tritium: Known as Hydrogen-3, features two neutrons in its nucleus.

Basic Atomic Concepts

Elements: Composed of atoms that are all of the same type, defining the chemical properties of the matter.
Atoms: The fundamental building blocks of elements, incredibly small, with about one million atoms fitting across a hair's width.

Subatomic Particles

Proton: A positively charged particle located in the nucleus, its number corresponds to the atomic number, with a mass of one atomic mass unit (amu).
Electron: A negatively charged particle that orbits the nucleus, contributing to an atom's charge balance.
Neutron: A neutral particle found in the nucleus. Neutrons can vary among isotopes while still identifying as the same element.

Measurement and Constants in Chemistry

Average Atomic Mass: The weighted average of the atomic masses of an element's naturally occurring isotopes, commonly found in the periodic table beneath the element symbol.
Atomic Mass Unit (amu): A standard unit for measuring atomic mass, equivalent to approximately 1.660540 x 10^-27 kg.
Avogadro's Number: A fundamental constant in chemistry representing the quantity 6.02214076 x 10^23, which quantifies the number of particles in one mole.
Mole: The amount of substance that contains exactly Avogadro's number of specified entities, typically atoms or molecules.

Description

Test your knowledge on fundamental atomic concepts including atomic number, isotopes, and specific hydrogen isotopes such as protium and deuterium. This quiz will challenge your understanding of the basic building blocks of matter and their properties.