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Intro. to Atoms
Organizing Elements
Metals
Nonmetals &Mettalloids
Radioactive Elements
100
The atomic number of an element is determined by the nuber of a. protons b. electrons c. nuetrons d. isotopes
What is a. protons
100
The rows in the periodic table are called a. groups b. periods c. nonmetals d. metals
What is b. periods
100
Of the following, th group that contains elements that are the most reactive is the _________. a. alkali metals b. alkaline metals c. carbon family d. noble gases
What is alkali metals
100
At room temperature, more than half of the nonmetal elements are: a. alloys b. gases c. liquids d. solids
What is b. gases
100
____________ are unstable atoms, with differing number of protons and neutrons that are involved in spontaneously emitting energy.
What is isotopes
200
Two isotopes of an element have the same number of ______________ but different numbers of ___________ .
What is same number of protons but different number of neutrons.
200
Mendeleev constructed the first periodic table, which is an arragement of elements showing the repeating pattern of their ____________ .
What is properties.
200
A property of metals is high thermal conductivity, which is ______________________ . a. the ability to be hammered or rolled into flat sheets b. the ability to be pulled or drawn out into long wires c. the ability of an object to conduct electricity and heat
What is conductivity
200
Unlike metals, solid nonmetals are: a. good conductors of heat and electric current b. malleable c. dull and brittle d. ductile
What is dull and brittle
200
Isotopes that release fast moving particles and energy are __________. a. radioactive b. alloys c. symbol d. a model
What is a. radioactive
300
Scientific theories often make use of _________, which are representations of an idea to help scientists understand what they cannot observe directly.
What is models.
300
Draw one element box from the periodic table. Label the atomic number, chemical symbol, name, atomic mass
What is see picture on page 83
300
In general, which of the following statement about metals is true? a. metals need to be stored in sealed containers for safety b. metals are malleable, ductile, and can carry an electric current c. metals are highly reactive substances d. metals do not react with oxygen
What is b. metals are malleable, ductile, and can carry an electric current
300
The elements that do not ordinarily form compouds are: a. elements in the carbon family b. metals c. halogens d. noble gases
What is d. noble gases
300
A radioactive isotope that can be followed through a chemical reacton or industrial process is called a ___________.
What is tracer
400
TRUE OR FALSE? Atoms with the same number of protons and different numbers of neutrons are called alloys.
What is FALSE - alloys, isotopes
400
Mendeleev created the first periodic table by arranging elements in order of
What is increasing atomic mass
400
The two most common alkaline earth metals are: a. copper and zinc b. iron and silver c. sodium and potassium d. calcium and magesium
What is calcium and magesium
400
TRUE OR FALSE: Nonmetals can be found on the left side of the periodic table.
What is FALSE - RIGHT
400
Beta radiation consists of particles that are identical to a. helium nuclei b. hydrogen atoms c. x-rays d. electrons
What is d. electrons
500
What part of an atom gives it its' mass?
What is the nucleus.
500
From an element's location in the periodic table, you can predict
What is it's properties
500
Using the periodic table, predict which element - potassium, aluminum, or iron is most reactive. Explain your answer.
What is Potassium. The metals in group 1 are more reactive than other metals.
500
What property of metalloids make them important to the computer industry?
What is SEMICONDUCTIVITY - ability to conduct electric current under some conditions and not under other conditions.
500
Thorium-230 has changed into Radium-226 describe what kind of radioactivity has taken place.
What is Release on an ALPHA PARTICLE - 2 protons, 2 neutons released