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SHMS7 Intro to Atoms

Ch 3 sec 1

Nucleus The central core of an atom containing protons and usually neutrons.
Proton A small, positively charged particle in the nucleus of the atom.
Neutron A small particle in the nucleus of the atom, with no electrical charge.
Electron A tiny negatively charged particle that moves around the nucleus of an atom.
Atomic Number The number of protons in the nucleus of an atom.
Isotope An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
Mass Number The sum of protons and neutrons in the nucleus of an atom.
Model In science, a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world
Describe the structure of an atom Atoms are made of even smaller particles called protons, neutrons and electrons.
Describe the elements in terms of their atoms An element can be identified by the number of protons in the nucleus of its atoms
Explain how models are useful for understanding atoms Because atoms are so small, scientist create models to describe them
Created by: sciencegirl