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Science Chapter 4

Study Guide- Lesson 1&2

the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element atom
tiny, negatively charged particle that moves around the outside of the nucleus of an atom electron
the central core of an atom which contains protons and neutrons nucleus
small, positively charged particles that are found in the nucleus of an atom proton
a region of an atom in which electrons of the same energy are likely to be found energy level
a small particle found in the nucleus of an atom with no electric charge neutron
the number of protons in the nucleus atomic number
an atom with same number of protons and different number of neutrons from other atoms of the same element isotope
the sum of protons and neutrons in the nucleus of an atom mass number
the average mass of all the isotope of an element atomic mass
an arrangement of the elements showing the repeating pattern of their properties periodic table
one or two letter representation of an element chemical symbol
a horizontal row of elements in the periodic table period
elements in the same vertical column of the periodic table; also called families group
Who created the first version of the periodic table? Dimitri Mendeleev
What are the three major groups on the periodic table? metals, nonmetals, and metalloids
How do you find the number of neutrons in the nucleus of an atom? 1st- round the atomic mass to a whole number 2nd- subtract the atomic number from the mass
What tells you the number of protons and electrons? atomic number
How many electrons can each shell hold? 1st- 2 2nd- 8 3rd- 18 or 8 4th- 32
If an element is in the 2nd period, how many shells will it have? 2
If an element is in the 5th group, how many valence electrons will it have? 5
Created by: southern_flair