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Chemistry Ch. 2

section 2.7-2.9

The mass for 1 mole of any substance is called the ___ molar mass
When referring to elements, we use ___ atoms
When referring to compounds, we use ___ molecules
g/mol is the same thing as: atomic mass unit (amu)
Elements are organized by __ increasing atomic number
Elements in the same row left to right are called: periods
Periodic Law states: when elements are arranged by increasing atomic mass, certain properties reoccur periodically
The percentage that each isotope is present in nature is referred to as ____ natural abundance
____ is used to measure the mass of an isotope and relative abundance mass spectrometry
To find the atomic mass you must: 1. multiply mass by its percentage 2. find product of each expression
____ metals transition between different charge states transition
Metals always form a ___ charge positive
____ are shiny, malleable, and conduct electricity. metals
The two types of metals are: alkali and alkali earth metals
Alkali metals are: soft, low melting point, & reactive [increasing down group]
Alkali earth metals are less ___ than alkali metals reactive
Metalloids has the properties of: metals and nonmetals
Nonmetals are ____ poor conductors of heat and electricity [brittle]
What are the 2 type of nonmetals? Noble gases and halogens
The most reactive group of nonmetals are: halogens
Noble gases are ___ nonreactive [decreasing down group]
Created by: Mariahj25