Semester 1 Physical Science Review

smallest unit of matter

• element

• atom

• molecule

• nucleus

positively charged particle

• proton

• neutron

• electron

subatomic particle with a neutral charge

• proton

• electron

• neutron

The number on the periodic table for each element that shows how many protons and electrons it contains.

• mass number

• valence electron

• atomic number

The number of outermost electrons in the atomic structure.

• protons

• valence electrons

• neutrons

• atomic number

An organized diagram of all the elements.

• periodic table

• Lewis dot diagram

• isotope notation

A negatively charged subatomic particle.

• protons

• neutrons

• electrons

Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons and therefore different mass numbers.

• mass number

• isotope

• valence electron

The total number of protons and neutrons of each element.

• atomic number

• mass number

• valence electrons

The center of an atom that contains protons and neutrons, also where the majority of the mass of an atom is contained.

• protons

• electrons

• neutrons

• nucleus