Structure of the Atom
Masses of Atoms
The Periodic Table
Problems 1
Problems 2
100
The atomic number on the periodic table tells you these two things.
What is the number of protons and electrons?
100
Elements contained in the same group share this main characteristic that is responsible for many of their similar properties.
What is the same number of electrons in the outer shell?
100
The proper name of the rows on the Periodic Table is this.
What is a period?
100
This energy level can contain only 2 electrons.
What is the first energy level?
100
Uranium (U) is listed on the periodic table as having a mass number of 238.036 amu. In addition, it exists in several forms: U-238, U-235, and U-234. Based on this information, we can infer that this isotope is the predominant form of Uranium.
What is U-238?
200
The mass number of any given element is the combined masses of these two subatomic particles.
What is the number of protons and neutrons?
200
These are the common properties of metals.
What are conductive, shiny, and malleable?
200
As elements go from left to right on any given row, electrons in the outer shell of the atom do this.
What is increase?
200
This energy level can contain only 8 electrons.
What is the second energy level?
200
Elements in the same group share this property with regard to their electrons.
What is the same number of electrons in their outer shells?
300
The predominant form of Berylium has a mass number of 9.012 and an atomic number of 4. Thus, Berylium has this number of neutrons.
What is 5 neutrons?
300
These are the common properties of nonmetals?
What are nonconductive, dull, and brittle?
300
The periodic table is arranged according to this number.
What is the atomic number?
300
This energy level can contain only 18 electrons.
What is the third energy level?
300
Molecules of water have been known to have different masses. An explanation for this phenomenon is this.
What is the molecules contain isotopes?
400
The mass numbers on the Periodic Table contains decimals even though any given atom contains only whole numbers of protons and neutrons, each weighing 1 amu each. The reason for this incongruity is this.
What is the listed mass number is a weighted average?
400
These are the common properties of metalloids?
What are both the properties of metals and nonmetals?
400
Changing the number of protons an element has results in this.
What is a new element?
400
This energy can contain only 32 electrons.
What is the fourth energy level?
400
Compared to their non-isotopic forms, isotopes not only have differing numbers of neutrons, but this property as well.
What is different masses and/or radioactivity?
500
This is the reason why Group 18 elements (the noble gases) are unreactive.
What is a full outer shell of electrons?
500
The proper name of the vertical columns on the Periodic Table is this.
What is group?
500
A half-life is this.
What is the time it takes for ½ of the amount of an isotope to transmutate into another substance?
500
Carbon-14 and Carbon-12 differ in their numbers of this sub-atomic particle.
What is the number of neutrons?
500
Fluorine has an atomic number of 9 and a mass number of 18.998 amu. Thus, Fluorine has this number of neutrons.
What is 9 or 10 neutrons?
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