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Chemistry Chapter 5

Chapter 5 Review

In a periodic table, a set of properties repeats from row to row
The atomic mass of an element is the value that depends on the distribution of an elements isotopes in nature and the masses of those isotopes
Mendeleev organized elements in his periodic table in order of increasing mass
One-twelfth the mass of a carbon-12 atom is used to define an amu-12 atom
The usefulness of Mendeleev's periodic table was confirmed by its ability to predict
The atomic mass unit (amu) is defined as one-twelfth the mass of an carbon-12 atom
Atoms of the most reactive elements tend to have valence electrons
Reactive elements, such as alkali metals and halogens, are found in nature only as compounds
The unit for atomic mass is amu
When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same group
The standard on which the atomic mass unit is based is the mass of a Carbon-12
The two most reactive groups of elements in the periodic table are the alkali metals and the halogens
Among the alkali metals, the tendency to react with other substances increases from top to bottom within the group
The pattern of repeating properties of elements revealed in the periodic table is known as the Periodic law
Hydrogen does not have the typical properties of a metal. However, hydrogen is located above Group 1A because it has one Valence electron
Which halogen is most likely to react? Bromine
To keep them from reacting, some highly reactive elements are stored in argon
Mendeleev predicted that the undiscovered element he called eka-aluminum would have an ___________ melting point low
Which of the following group 7A elements is the most reactive ? Flouorine
Fertilizers usually contain two elements from group 5A, which are _______ and phosphorus Nitrogen
Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element? Mass number
Element 3, lithium, has one valence electron, and element 4, beryllium, has two valence electrons. Element 5, boron, has __________ valence electrons 3
Which statement is true about the metalloid silicon? Silicon is a better conductor of an electric current than sulfur is
Although they are called _____ lights, they can contain any noble gas. Neon
Mendeleev organized elements in his periodic table in order of increasing Mass
Two highly reactive elements in Period 4 are the metal potassium and the Nonmetal bromine
Compared with Group 2A elements, Group 6A elements have more valence electrons
Boron is one block to the left of carbon in the periodic table. The atomic number of carbon is 6. The atomic number of boron is 5
At room temperature, none of the metals are gases
Group 7A of the periodic table contains the most reactive nonmetals
The elements Cesium (Cs), Barium (Ba), and Lutetium (Lu) appear from left to right in Period 6 in the Periodic Table. Of these elements, _____ is the most reactive. Cesium (Cs)
A member of the Boron family has three valence electrons, while a member of the nitrogen family has 5
Elements can be classified as metals, nonmetals, and metalloids
Which element is found in nature only in compounds? Sodium
Which of these Group 1A elements is the most reactive? Cs(Cesium)
One way to demonstrate reactivity among the alkaline earth metals, Group 2A, is to observe what happens when they are placed in ____ water
Which of the following gases emit color when an electric current is applied? Helium and neon
The tendency of an element to react chemically is closely related to the number of valence electrons in atoms of the elements
Which element is found in most of the compound in your body except for water? carbon
From left to right across a period in the periodic table, elements become less ______ and more _______ metallic/nonmetallic
Metals that grow dull when exposed to air are more _____ than metals that reman shiny. Reactive
Mendeleev gave the name eka-aluminum to a (an) Unknown element he predicted would have properties similar to those of aluminum
In general, a _____ metal will be more reactive than an alkaline earth metal in the same period. Alkali
Which list of elements contains only metals? sodium,chromium, copper
To determine the atomic mass of an element, you would take a _______ average of the isotopes that make up that element. Weighted
Which general statement does NOT apply to metals? Most metals are brittle
Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown elements
As you move from left to right across a period, the number of valence electrons increases
Which statement is NOT true about the elements fluorine, chlorine, and iodine? They are similar to noble gases.
Created by: Deja Warren



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