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Periodic Table of Elements
Chapter 5 Test - workbook pages
Terms in this set (47)
The first elements to be identified were mainly gases. True or False?
Why does the number of elements per period vary?
The number of available orbitals increases form energy level to energy level.
Properties of elements repeat in a predictable way when atomic numbers are used to arrange elements into groups. This pattern of repeating properties is called the ...?
Mendeleev needed to organize information about 63 elements. True or False?
Mendeleev's strategy for classifying elements was modeled on a(n) ___________.
Circle the letter of each type of information Mendeleev knew about each element.
b. number of protons
c. relative mass
a, c, d
Mendeleev arranged the elements into rows in order of _______________ so that elements with similar properties were in the same column.
A periodic table is an arrangement of elements in columns , based on a set of properties that represent from row to row. True or False?
Why did Mendeleev leave some locations in his his periodic table blank?
He had to leave blank spaces for elements that hadn't been discovered.
What two elements have similar properties?
bromine and chlorine
How decide Mendeleev decide where to place Arsenic and Selenium?
based on their masses
Mendeleev was the first scientist to arrange elements in a periodic table. True or False?
A test for the correctness of a scientific of a scientific model is whether the model can be used to make accurate future predictions.
Mendeleev used the _________________________ located near the spaces in his table to predict properties for undiscovered elements.
properties of elements
The close match between Mendeleev's predictions and the actual properties of new elements showed _________________.
how useful to periodic table could be.
Circle the letter of each element that was discovered after Mendeleev's periodic table that supported Mendeleev's predictions and provided evidence validating the table.
a. gallium b. scandium
c. germanium d. aluminum
a, b, c
The mass of an atom of chlorine-37 is _________ than the mass of an atom of chlorine-35?
All values are equally important in a weighted average. True or false?
Across a period from left to right, the elements become ___________ metallic and ____________ nonmetallic in their properties.
An electron that is in the highest occupied energy level of an atom is a(n) _________ electrons.
Elements within a group have the _______ number of valence electrons.
The reactivity of alkali metals __________ from the top of Group 1A to the bottom.
Which properties go with magnesium and which properties go with calcium?
a. Helps build strong teeth and bones.
b. Helps plants produce sugar.
c. Is used to make lightweight bicycle frames.
d. Is the main ingredient in limestone.
Magnesium - b and c
Calcium - a and d
Which is true about aluminum.
a. It is the most abundant metal in Earth's crust.
b. It is often found combined with oxygen in bauxite.
c. It is more reactive than sodium and magnesium.
d. It is good conductor of electric currents.
a, b, and c
Except for water, most of the compounds in your body contains _____________.
List the nonmetals in Group 5A.
nitrogen and phosphorus
Name two elements in the nitrogen family that are contained in fertilizer.
nitrogen and phosphorus
List the two metalloids in Group 5A.
silicon and germanium
List the four metal in Group 3A.
Aluminum, Gallium, Thallium, and Indium
Sodium is stored under oil because it ___________.
will react will oxygen and water vapor in the air.
Difference in reactivity among alkaline earth metals are shown by the way they react with ____________.
Which Period 3 elements are highly reactive?
sodium and chlorine
What is true about nonmetals?
A. Nonmetal are poor conductors of heat and electric current.
B. many nonmetals are gases at room temperature.
C. Some nonmetals are extremely reactive and other hardly react at all.
D. Nonmetals that are solids tend to be malleable.
a, b, and c
An important property of transition elements is their ability to form some compounds with __________?
All metals react with oxygen in the same way. True or false?
What are the three categories into which elements are classified based on their general properties.
Metals, nonmetals, and metalloids
Most elements exist as a mixture of two or more isotopes. True or false?
What is true about a carbon-12 atom?
It has 6 protons, 6 neutrons, it is used as a standard for comparing the masses of atoms, and atomic mass unit is defined as one twelfth the mass.
A value that depends on the distribution of an element isotopes in nature and the masses of isotopes
What are the four things listed on a element on the periodic table?
atomic number, element symbol, element name, and atomic mass
Whats categories did Antoine Lavoisier use to classify elements?
gases, metals, and non-metals
List the non-metals in Group 6A
oxygen, sulfur, and selenium
Name the most most abundant element in Earth's crust.
List four non-metals in group 7A
Fluorine, Chlorine, Iodine, and Bromine
halogens have similar ___ properties but different ___ properties
Name three characteristics of noble gases.
colorless, odorless, and extremely unreactive
How can an element that does not react easily with other elements be useful?
used instead of oxygen (not reactive)
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