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Elements of the Periodic Table (Ch 3)

Name:________________________
Class: ___________ Date: ________
Across
_____ is the most common alkaline earth metal.
A ______ material can be pulled out into long wires.
Fluorine and Chlorine are _____ which means "salt-forming".
The smallest particle that can still be considered an element.
Compounds that contain carbon are ________.
O. is a _____ molecule, two oxygen atoms are bonded together.
The most reactive metals are the _______ metals.
The sum of the number of protons and neutrons in the atom is the _______ number.
Devices called particle _______ move atomic nuclei at extremely high speed.
______ are between metals and nonmetals.
The periodic table is arranged in rows called ________.
In a process called nitrogen _______, certain bacteria use nitrogen from the air to make compounds plants can use.
_______ conductivity is the ability of an object to transfer heat.
Iron, copper and gold are ______ metals.
______ gases are usually nonreactive.
Positively charged particle in an atom.
Proteins, DNA and fats all contain the element ________.
Mendeleev created the first _______ table of elements.
Down
The _____ mass of an element is the average mass of all the isotopes of that element.
Atom's with the same number of protons and different numbers of neutrons are called _______.
Atom's negatively charged particle.
The ______ - _____ of a radioactive isotope is the length of time needed for half of the atoms of a sample to decay.
Center of the atom - area that contains protons and neutrons.
_____ are elements that are good conductors of electric current and heat.
A _______ material is one that can be hammered and rolled into flat sheets or other shapes.
A substance that breaks easily is _______.
Chemical _____ contain either one or two letters that are an abbreviation of the element's name.
The number of protons in the nucleus of an atom is the ______ _______ of that atom's element.
The ease or speed with which an element combines, or reacts, with other substances is called its _______.
Nonmetals are on the _____ side of the periodic table.
Particle in the nucleus that has no charge.
_____ is a semiconductor, it can conduct electricity under some conditions but not under others.
The elements in a column form a _________.
A material that has _____ is shiny and reflective.