Presentation on theme: "Journal 41) Section #1 Key Terms: atom, nucleus, proton, neutron, electron, energy level, atomic number, isotope, mass number List on LEFT side of Cornell."— Presentation transcript:
1Journal 41)Section #1 Key Terms: atom, nucleus, proton, neutron, electron, energy level, atomic number, isotope, mass numberList on LEFT side of Cornell Notes (you may have them from yesterday)Find and record definitions (pg )
2Definitions: 1) The basic particle from which all elements are made 2) Center core of an atom3) Positively charged particle in nucleus4) Particle in nucleus with no electric charge5) Negatively charged particle outside of nucleus
36) Electron’s energy, related to distance from nucleus (shell / orbit / cloud) 7) Number of protons in atom (number on periodic table)8) Atoms of same element with different numbers of neutrons9) Sum of the protons and neutrons in the atom’s nucleus
4Draw Lithium atom 7Li Label all parts & use a quarter of the page Atomic number = 3Mass number = 7Nucleus (protons and neutrons)Electrons (2 in first energy level and1 in second energy level)Electrical charges
5Draw 6LiAnother isotope (less common in nature) has a mass number of 6Draw it (How is it different from the first drawing?)
6Academic Words“This new particle, called a neutron, was hard to detect because it has no electric charge.”Detect: to discover or determine the existence, presence, or fact ofEx: Scientists have used modern telescopes to detect distant stars
7Academic Words“A period contains a series of different elements.”Series: a number of things or events of the same class coming one after the otherEx: Juan’s house is one of a series of houses all built on the same block by the same builder.
8Academic Words Similar: having characteristics in common “The metals in a group, or family, have similar properties, and these family properties change gradually as you move across the table.”Similar: having characteristics in commonEx: Gold and silver are similar in many ways.
9Distributes: gives out or delivers Academic Words“There, it is absorbed into your bloodstream, which distributes it all over your body.”Distributes: gives out or deliversEx: Our newspaper carrier distributes the local newspaper to all the families in our neighborhood.
10Academic Words“Becquerel assumed that sunlight was necessary for the energy release.”Assumed: taken as granted or true, supposedEx: Tara assumed that the bus would be late because it was always late on a rainy day.
11Section #2 1) Atomic mass 2) Periodic table 3) Period 4) Group 5) Chemical symbolCopy key terms on LEFT side of pageFind definitions on pages and record them on RIGHT side of page
12Mixed up DefinitionsRepresentation of an element usually consisting of 1 or 2 lettersHorizontal rows on periodic tableColumns on table, also called families, that contain elements with similar chemical propertiesAverage mass of all the isotopes of an elementArrangement of elements showing a repeating pattern of their properties
13Mendeleev created the periodic table in 1869 by arranging the 63 known elements in order of their atomic mass, then grouping them according to their physical propertiesLook at his list on page 133 and compare it to the periodic table on pages
14What do you know? Take a minute and look at your notes Tell your neighbor something you learnedWhat did your neighbor learn?
15Element Project Record of Research must be stamped! Work on your written project for the remainder of classRough draft is due this Friday