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Across
4.rare gruop of gases that include helium ,neon ,argon ,and krypton
6.the interval between succesive occurrencess of an event
7.an atom carring a positive charge
9.able to be hammered into different shapes
11.any chemical element that is lacking the characteerisstics of metal
14.number of photons
16.smallest part of an element
17.elements that make group 17 on the periodic table
18.a glistening shine (starts with a L)
19.an atom with no charge
Down
1.columns of elements on the periodic table
2.shortened way of writing the name of an element
3.appearing at regular intervals
5.number of photons and neutrons in the nucleus
8.particles that have a negative charge
10.total mass of photons and neutrons
11.the central part of an atom
12.element that has the property of shiny luster, ductility, and malleability
13.able to be drawn into thin wires
15.substance that cannot be chemically broken down into simplier forms

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