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100
Moseley make the discovery of the value of atomic number using this technique.
What is x-ray
100
Electronegativity and Ionization energy will do this when you move down a group.
What is decrease
100
This group is on the far right side of the periodic table and its elements are unreactive.
What are noble gases
100
This is the energy required to remove an electron from an atom or ion.
What is ionization energy
100
Groups are to columns as rows are to this.
What are periods
200
This many elements appeared on the first periodic table made.
What is 63
200
This will decrease as you move across a period.
What is atomic radius
200
This group of elements spans across groups 3-12 of the periodic table and do not have identical electron configurations.
What are transition metals
200
This is the measure of the ability of an atom to attract electrons.
What is electronegativity
200
Mendeleev arranged his first table by this atomic property, rather than atomic number.
What is atomic mass
300
This Russian chemist was the first to produce an orderly arrangement of the elements.
Who is Mendeleev
300
These elements occupy group 17 and are highly reactive.
What are halogens
300
An atom in group 17 will for this type of ion.
What is an anion
300
This number of elements are on the periodic table, the rest are man made.
What is 90
400
This scientist coined the law of octaves, after he noticed that properties repeat every eight elements.
Who is Newlands
400
Ionization energy and electron affinity will do this as you move across a period
What is increase
400
This element has its own group and is the most plentiful element in the universe.
What is Hydrogen
400
This is the energy change that occurs when a neutral atom gains an electron.
What is electron affinity
400
Elements in the same group will also have this in common.
What is same number of electrons
500
This chemist improved Mendeleev's design of the periodic table, arranging the elements by their atomic number.
Who is Moseley
500
These types of metals will decrease as you move across the periodic table.
What is Alkali Metals
500
These elements are on the far left side of the periodic table and are highly reactive.
What are Alkali Metals
500
This causes the outermost electrons to be held less tightly to the nucleus.
What is electron shielding
500
This element was the first to be artificially made.
What is Technetium