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Science 3 1-2

Science Chapter 3 Sections 1&2

Nucleus the central core of an atom containing protons and usually electrons.
Proton A small positively charged particle in the nucleus of the atom.
Neutron A small particle in the nucleus of the atom, with no electric charge.
Electron A tiny, negatively charged particle that moves around the nucleus.
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 mathmatical statement, or an object that helps explain ideas about the natural world.
Period a horizontal row of elements in the periodic table.
Group Elements in the same vertical column of the periodic table; also called families.
Chemical symbol A one or two letter representation of an element.
Atomic Mass The average mass of all of the isotopes of an element.
What are the three particles found in an atom? Protons, Neutrons and electrons.
What are the two particles found in the nucleus? Protons and Neutrons
What two particles have the same number in an atom? Protons and electrons.
How many protons are in a Carbon atom? 6
Explain how elements are identified in terms of their atoms. Elements are often identified by the number of protons ( which is the same as the number of electrons) this is called the atomic number. Or thy identify them by atomic mass which is a total of the protons and neutrons in the nucleus.
Why do scientists use models to study atoms? Atoms are so small that use models to describe them.
How did Mendeleex arrange the first periodic table? In increasing atomic mass.
What do elements in the same column have in common? They have similar characteristics.
What can you predict about an element based on it's position in the table. Elements to the left are highly reactive elements. Elements in the middle are relatively unreactive. They elements on the very right of the able are nonreactive gases.
Created by: egtx