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Unit 3: Atomic Structure and the Periodic Table

Across
Elements of group 2A are called ____ metals.
The number of neutrons in aluminum-27
A positively charged subatomic particle that also has mass.
Uranium (U), neptunium (Np), plutonium (Pu) and curium (Cm) are all part of the _____ series.
A subatomic particle that holds no charge but has mass.
Cathode rays emitted from the electrons in the the cathode ray tube experiment repelled this.
Physicist that determined the nuclear model of the atom
The smallest unit of an element that still has the properties of that element.
Cesium (Cs) is categorized as an _____ metal.
Shared properties among elements in a group are based on electron _____.
These elements are good conductors of heat and electricity.
According to part of Dalton's atomic theory, atoms of different elements combine to form whole-number _____.
Noble gases are also called ____ gases.
The mass number of an atom containing 23 protons and 25 neutrons.
_____ means is can be hammered into sheets.
Elements of the B groups are called ____ metals.
The ____ number of an element represents the number of protons and neutrons in an atom.
The ____ number of an element represents the number of protons in an atom.
Russian chemist that published a periodic table of over 60 elements in 1869.
Noble gases have a full set of _____ electrons.
Dalton transformed Democritus' ideas into a scientific _____.
This British physicist determined the atomic number of each element.
Down
The current periodic table of elements is arranged in order of increasing _____.
This was shot at the thin layer of gold foil and was expected to pass straight though
A negatively charged subatomic particle that has insignificant mass.
This element contains 31 protons.
Another part of Dalton's atomic theory erroneously stated that all atoms of the same element are ______.
These elements are brittle and poor conductors of heat and electricity.
Xenon (Xe) is categorized an a _____.
An erroneous model of the atom until about 1910.
Groups 1A-7A are also called the _____ elements.
Small, dense, positively-charged center of an atom
A set of three elements with similar properties.
Average mass of all the isotopes of an element, weighted by each isotopes' abundance.
Atoms of the same element that vary in the number of neutrons
Boron (B), silicon (Si), germanium (Ge), and arsenic (As) are all categorized as _____.
Cerium (Ce), promethium (Pm), samarium (Sm) and terbium (Tb) are all part of the _____ series.
This element has 11 electrons in its neutral form.
Elements of group 7A are called _____.
Last name of the scientist that conducted the cathode ray tube experiment.