Among either columns or rows, elements arranged in one of these two patterns share similar chemical and physical properties
columns
100
The periodic table can be separated, left to right, into these three general categories divided by a stair step pattern
metals, metalloids, non-metals
100
The Group B elements comprise these two classifications of metals
transition and inner transition
100
At room temperature, different elements occur in these three different phase states
solid, liquid, gas
100
This number defines the number of protons in an atom
atomic number
200
Elements in a row gradually change in physical and chemical characteristics and periodically return to previously demonstrated characteristics as a new row begins; thus rows are called these
periods
200
Elements that are neither metals nor non-metals, but are transitional among these classifications, are called what?
metalloids
200
The rare earth elements are also known as these
inner transition metals
200
Most elements occur in this phase state at room temperature
solid
200
The count of this sub-atomic particle defines the elemental identity of an atom
proton
300
This is the number by which elements in the periodic table are ordered
atomic number
300
The four properties that distinguish among metals and non-metals
The most refined classification into which both Hydrogen and Beryllium can be assigned
Group A elements
300
This halogen occurs in a liquid phase at room temperature
Bromine
300
This number is the sum of the number of protons and of the average number of neutrons in atoms of an element
atomic mass (atomic weight)
400
Russian chemist Dmitri Mendeleev first ordered the elements into periods, and left blanks where necessary to allow elements with similar characteristics to align into columns. In so doing, Mendeleev predicted the discovery of these new forms of matter that would fill in the blanks
additional elements
400
This pattern can be drawn on the periodic table to separate metals and non-metals; further, metalloids intersect with this pattern
stair step
400
The most refined classification into which each of Iron, Cobalt and Nickel can be assigned
Group 8B
400
Each of these three alpha-numeric groups have only one element that occurs in a gas phase at room temperature
1A, 5A, 6A
400
The number of neutrons in an atom can be calculated by finding the difference among these two numbers
atomic mass - atomic umber
500
This law states that elements, when arranged by atomic number, will periodically demonstrate similar chemical and physical characteristics
periodic law
500
The number of non-metals, aside form the noble gasses, that are gaseous at room temperature
5
500
The most refined classification into which each of Sodium, Carbon and Argon can be assigned
Representative elements
500
Mercury, the only metal occurring as a liquid at room temperature, is in this family
Zinc
500
An atom of Nitrogen with an atomic mass of 15 will have how many protons?