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Across
3.made of two or more elements chemically combined
5.number of atoms in one water molecule
6.vertical column on the periodic table
9.horizontal row on the periodic table
11.the type of bond formed when atoms transfer electrons
13.measures how good an atom is at attracting electrons
15.elements in group 7A
17.covalent bond in which two pairs of electrons are shared
18.subatomic particle with a negative charge
19.the type of electron found in the outermost shell of an atom
21.ion with a negative charge
22.an atom that has gained or lost electrons
23.the mass of one mole of a substance
Down
1.these numbers are used to balance a chemical equation
2.these numbers tell you how many of each atom there are in a molecule
3.type of reaction that always produces carbon dioxide and water
4.smallest unit of an element
7.the substance formed in a chemical reaction
8.used to convert between different units
10.the number of particles in 1 mole of a substance
12.the type of bond formed when atoms share electrons
14.atoms with the same number of protons but different numbers of neutrons
16.elements with a stable octet
20.Na+ is an example

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