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Atomic Structure & Periodic Table

Across
The subatomic particle discovered by JJ Thomson.
Another name for Eka-silicon, the "unknown" element predicted by Mendeleev.
These elements are typically shiny solids at room temperature.
Modern _____ _____ began with a series of postulates laid out by John Dalton in the early 1800's.
Common name for the most reactive group of nonmetals in the periodic table.
Rutherford's investigation of ____ particle scattering led to the discovery of the nucleus.
The subatomic particle that gives the nucleus a charge.
A unit used for the mass of an atom. (3 words)
The highest energy subatomic particles in an atom that are responsible for the chemical properties of the elements. (2 words)
Elements in this row of the periodic table tend to be radioactive.
Class of elements that are typically gases at room temperature and non-conductors of heat and electricity.
The sum of protons and neutrons in an atom.
An adjective describing the property of a substance that can be hammered into thin sheets.
H-1 and H-2 have different numbers of this subatomic particle.
With respect to Mass or matter, this is a fundamental law.
Down
The most recognized symbol of chemistry, it is used to predict and explain trends in the properties of elements.
Members of this group of elements are in the middle of the periodic table and often form colorful compounds.
The group of elements conduct electricity and are both malleable and ductile.
Vertical columns of elements in the periodic table which are numbered 1-18.
These elements are on the right side of the periodic table and have 5, 6, 7, or 8 valence electrons.
Atoms of the same element that have different mass numbers.
This is the smallest particle of matter.
Members of this group 18 family of elements are mostly unreactive (inert).
Elements in the periodic table are arranged in order of increasing ____ _____.
This physical property is a characteristic of metals that reflects a usefulness in electrical circuits.
The discovery of electrons came about from experiments with a _____ ____ tube.
These elements exist on either side of a stair-step region or line on the periodic table.
A particle consisting of two or more atoms joined by a chemical bond.
The small dense core of an atom that is only about 1/100,000 the overall size of the atom.