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100
Periodic Table
What is a table illustrating the periodic system, in which the chemical elements, formerly arranged in the order of their atomic weights and now according to their atomic numbers, are shown in related groups.
100
Mendeleev
What is Russian chemist: helped develop the periodic law.1834–1907,
100
Moseley
Who is a British Chemist who developed X-RAY SPECTRA TO STUDY ATOMIC STRUCTURE
100
period
What is a row of elements
100
groups
What is columns of elements
200
Periodic Law
What is the principle that chemical properties of the elements are periodic functions of their atomic numbers
200
atomic mass unit
What is A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton
200
metals
What is A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations).
200
non-metal
What is One of the elements which do not exhibit metallic properties
200
metalloids
What are the elements found along the stair-step line that distinguishes metals from non-metals.
300
transition elements
What is those elements having a partially filled d or f subshell in any common oxidation state.
300
valence electrons
What is electrons in the last shell or energy level of an atom
300
alkali metals
What is found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature
300
alkaline earth metals
What is metallic elements found in the second group of the periodic table. All alkaline earth elements have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found free in nature.
300
boron family
What is the semi-metal Boron (B) and metals Aluminum (Al), Gallium (Ga), Indium (In), and Thallium (Tl).
400
nitrogen family
What is The nitrogen family consists of nitrogen, phosphorus, arsenic, antimony and bismuth Nitrogen family elements consists of atoms having 5 electrons in their outer energy level.
400
oxygen family
What is The chalcogens family is also known as the oxygen group. Group 16 or VIA Oxygen Group or Chalcogens 6 valence electrons diverse properties, changing from nonmetallic to metallic as you move down the family best known member of this group is oxygen
400
average atomic mass
What is The average atomic mass of an element is the sum of the masses of its isotopes each multiplied by its natural abundance.
400
halogens
What is The halogens are five non-metallic elements found in group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts"
400
ground state
What is the state of a physical system (as of an atomic nucleus or an atom) having the least energy of all the possible states —called also ground level
500
excited state
What is : Excited state refers to an atom, ion or molecule with an electron in a higher than normal energy level than its ground state.
500
noble gas
What is any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.
500
63
What is the total number of elements
500
non-metals
What poor conductors of heat and electricity
500
the majority of elements
What is metals
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