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Chapter IPC18 review


The central core of an atom is called the _______. Nucleus
The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the _____. Periodic table
The mass of an _____ is about equal to the mass of a proton. Neutron
Elements arranged in vertical columns in the periodic table are called _____. Groups
The region around the nucleus occupied by the electrons is called the____. Electron cloud
The symbol for chlorine is____. Cl
The maximum number of electrons in the second energy level of an atom is _____. 8
Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two____. Neutrons
Metals are ____ conductors of heat and electricity. Good
Scientists believe that naturally occurring elements are manufactured within the _____. Sun and stars
So far, scientists have confirmed the existence of _____ different quarks. 6
In 1926, scientists developed the ______ model of the atom that is in use today. Electron cloud
The sum of the number of protons and neutrons in an atom is the_____. Mass number/ atomic mass
The symbol for _____ is Fe. Iron
A very stable electron arrangement in the outer energy level is characteristic of_____. Noble gases
One proton and one electron are ______ to each element as you go across the periodic table. Add
Electron _____ are used to show how electrons in the outer energy level are bonded when elements combine to form compounds. Dot diagram
The atomic number of an element is determined by its number of _____. Protons
According to present atomic theory, the location of an_____ in an atom cannot be pinpointed exactly. Electrons
Moving from left to right in a row of the periodic table, metallic properties_________. Reduce
Each inner energy level of an atom has a maximum number of ____ it can hold. Electrons
Dot diagrams are used to represent____. Outer energy electrons/levels
Particles of matter that make up protons and neutrons are ____. Quarks
A chemical symbol represents the _____ of an element. Name
Horizontal rows of the periodic table are called____. Periods
Atoms of the same element with different numbers of neutrons are called____. Isotopes
A particle that moves around the nucleus is a(n)____. Electron
Elements that are gases, are brittle, and are poor conductors at room temperature are ______. Nonmetals
A _____ is used to accelerate protons in the study of subatomic particles. Tevatron
A____ is used to accelerate neutrons in the study of subatomic particles. Cyclotron
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is _____. 56
Explain why the noble gases are stable. Their outer energy level is full
Compare the masses of protons, electrons, and neutrons. Protons and neutrons- 1 amu electrons- 0 amu
How are isotopes the same and how are they different? Same number of protons but different number of neutrons for that particular element
Explain why the periodic table is such a useful tool. Can use it to predict how many elements will react
Describe where the electrons are in the atom, where they have the least energy, and where they have the most energy. location in the atom- in the electron cloud around the nucleus least energy- closest to the energy in the cloud most energy- far out in the cloud
Chlorine's atomic mass is 35.453. List the two most reasonable isotopes of chlorine. Which one should be more common? Chlorine 35 and 36 and most common is Chlorine 35
A common radioactive isotope of carbon is carbon-14. How many protons and neutrons does it have? 6 protons and 8 neutrons
Cobalt's atomic mass is 58.9332. What is the most common isotope of cobalt? 59
What is the name of the symbols of the following elements: F, O, P, and S? Florine, Oxygen, Phosphorus, and Sulfur
What is the atomic number of the following elements: F, O, P, and S? 9,8,15,16
What is the average atomic mass of the following elements: F, O,P, and S? 19,16,31,32
What is the period of the following elements: F,O,P, and S? 2, 2, 3,3
What is the group of the following elements: F,O,P, and S? 17,16,15,16
What is unusual about the structure of hydrogen-1? It is the only atom that has 0 neutrons
How many groups and how many periods make up the periodic table? groups- 18 periods- 7
Do the elements Na and K belong to the same period or the same group? same group
Are the elements Na and K metals or nonmetals? metals
Are the properties of the two elements Na and K similar or quite different? similar because they are in the same group
At room temperature, will the elements Na and K be solids, liquids, or gases? solids
Suppose that you have just discovered a new element and have named it neptunite. While studying your new element, you find that it has two isotopes- neptunite-220 and neptunite- 250. What is the average atomic mass of your new element? 220+250=470 470/2= 235.... neptunite-235
Cont. (Assume that these 2 isotopes are present in equal amounts in nature.) 220+250=470 470/2= 235.... neptunite-235
Assume that an element is composed of one isotope with a mass of 142 and another isotope with a mass of 145. For each atom with a mass of 142 there are three atoms with a mass of 145. What is the average atomic mass of the element? 142+145+145+145=577 577/4= 144.25 amu
Created by: marykatescamardo