Atomic StructureChem Quest

Protons, Neutrons, and Electrons

Curriculum

Big Idea: Changes in matter are accompanied by changes in energy.

Concept: Isotopes are atoms of the same element with different numbers of neutrons.

PA Standard: “Identify the major components (protons, neutrons, and electrons) of the nuclear atom, and explain how they interact.”

Today’s Agenda

Opener: What subatomic particles have we learned about so far? What are their charges, and where are they located?

Go over Chem Quest: Atomic Structure POGIL(see handout)

Review Powerpoint on subatomic particles and atomic structure

Closure: What is a neutron? What is an isotope?Take Home Assignment: 4.3 Section Assessment

(page 119 in the big red book) to be checked tomorrow

Atom:the smallest particle of an element that retains its identity in a chemical reaction

Today’s Chemistry Word:The Atomic Nucleus Core of the atom Small Dense Positively charged Composed of protons (+) and neutrons (0)

Atomic Number

The whole numbers in the blocks of the periodic table

The number of protons in one atom of a given element

The number of electrons in a NEUTRAL atom of a given element

Every element has a different number of protons.

Mass Number

The total number of protons and neutrons in an atom of a given element

Round the atomic masses on the periodic table.

# neutrons = mass number – atomic number

Protons, Neutrons, Electrons

Isotopes of an Element

have different numbers of neutrons, so they have different masses.

Example:

neon-20, neon-21, and neon-22 are three isotopes of neon, a gaseous element used in lighted signs.

Isotopes of Hydrogen

Isotopes of Hydrogen

also called… Hydrogen-1 Hydrogen-2 Hydrogen-3

Atomic Mass

atomic mass unit (amu): one twelfth of the mass of a carbon-12 atom.

Example: helium-4 has about one-third the mass of a carbon-12 atom

Example: nickel-60 has about five times the mass of a carbon-12 atom.