History
locating elements on the periodic table
properties
outer electrons
gamble
100
This scientific tool can be used to predic properties of an element before it is discovered.
What is the periodic table
100
horizontal row of blocks
What is period
100
these are similar in all elements in a group
What is properties
100
electrons available to be lost, gained, or shared when atoms form compounds
What is valence electrons
100
the group in which potassium and sodium belong
What is group 1 or alkali metals
200
Mendeleev predicted that the spaces in his periodic table represented this
What is undiscovered elements
200
Radioactive elements with atomic numbers 90 to 103
What is actinides
200
elements to the right side of the periodic table (to the right of the stairstep)
What is nonmetals
200
The number of valence electrons in alkali metals
What is one
200
The number of valence electrons of bromine
What is 7
300
Since Mendeleev's time, a better arrangement than atomic mass for elements
What is using atomic number
300
Argon, krypton, and xenon
What is noble gases
300
The reason hydrogen is placed separetely from other elements
What is it has many unique properties
300
The first member of the noble gas family whose highest energy level consists of an octet of electrons
What is neon
300
reactivity of alkaline-earth metals compared to alkali metals
What is less reactive
400
The discovery of these elements added a new column to Mendeleev's periodic table
What is noble gases
400
name of the group with flourine and chlorine (not group number)
What is halogens
400
The most reactive group of the nonmetals
What is halogens
400
electrons involved in the formation of a chemical bond
What is valence electrons
400
for groups 13 through 18 the valence number is calculated with this formula
What is group number minus 10
500
The number of these determines the position of each element in the periodic table
What is protons
500
The group of 14f block elements in the sixth period
Lanthanides
500
Soft, silvery, reactive metals, all of which have one electron in the S orbital
What is alkali metals
500
the sublevels being filled in period 3
What is s and p
500
The letters of the orbitals where electrons are found in groups 13 through 18
What is s and p
M
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