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Ch 12: The Periodic Table- Arranging the Elements

Across
_______ are very reactive nonmetal elements. (225)
_______, which is a gas at room temperature, makes up about 80% of the air that you breathe. (224)
________ means “happening at regular intervals.” (214)
Many of the nonmetal elements are ______ at room temperature. (217)
The properties are similar because the elements within a group have the same number of ______ in their outer energy level. (221)
Mendeleev’s periodic table showed the elements in order of ______ ______. (215)
When you look at the elements on the periodic table, there are three ______ of elements. (216)
In 1914, scientists began using ______ ______. (215)
Elements in the first row are called ________. (227)
Mendeleev found that the pattern of elements ______ after every seven elements. (214)
Each row of elements, from left to right, is called a ______. (215)
__________ is an extremely reactive nonmetal. (224)
These symbols are used in the chemical formulas for _______. (217)
Each column of elements (top to bottom) is called a ______. (215)
______ _____ are unreactive gases found in Group 18 of the periodic table. (226)
Alkaline-earth metals are less _______ than alkali metals. (222)
Down
By the 1860s, scientists had discovered more than 60 different _______. (213)
_______ makes up about 20% of air. (225)
______ is the Greek word for sun. (226)
All of the elements follow the ________ ___. (219)
______ ____ are elements in Group 1 of the periodic table. (221)
A Russian chemist, Dmitri _________, discovered a pattern in 1869. (213)
Elements of Groups 3-12 are called ________ metals. (222)
Elements in the second row are called the _______. (227)
________ have some properties of metals and some properties of nonmetals (217)
______ also forms a wide variety of compounds. (224)
When you look at the periodic table, you can see that most of the elements are _____. (216)
______ is mixed with alcohol and used in hospitals. (225)
Each block also shows the chemical ______ of the element. (217)
Many of the transition metals have very high ______ points compared to other elements. (223)
_______ is used to treat water for drinking and swimming. (225)