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Science-Atoms Sect.1

What is a nucleus? It is the very small center core of an atom
What are protons? Positively charged. Found in the nucleus.
What are neutrons? No charge. Found in the nucleus.
What are electrons? They move rapidly around the nucleus and have a negative charge.
What is an atomic number? The number of protons in a nucleus.
What are isotopes? Atoms with the same number of protons and a different number of neutrons.
What is a mass number? The sum of the protons and neutrons in the nucleus of an atom.
What could a model be? A model could be a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world.
What are the three main particles in an atom? Protons, neutrons and electrons.
How do the particles of an atom differ in electric charge? Protons have positive charge. Neutrons have no charge and electrons have a negative charge.
Why do atoms have no electric charge even though most of their particles have charges? Each atom has equal numbers of positively charged protons and negatively charged electrons. They equal themselves out.
How do you know how many electrons are in an atom? Since electrons are equal to protons, look at the atomic number. The atomic number tells how many protons are in an atom.
Created by: eguldin