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Semester 2 Exam

Name: ________________________________
Across
A spontaneous emission of particles and rays
A helium nuclei
Bond held together by mobile electrons and cations
Represents a chemical reaction
6.02 x 10^23 particles
The mass of one mole
Outer shell electrons
Lowest whole # ratio of ions in a bond
Ion of more than one atom
Electrons shared unequally
Electrons are shared equally
An electron released from the nucleus
Group VII anion
A small whole # used to balance an equation
Down
The result of a chemical reaction
Time it takes for 1/2 of a nuclei to decay
A molecule made of atoms of the same type of element
An equation that shows the same amount of atoms on both sides
Unstable isotope
22.4 L
High energy released by a radioisotope
A neutral group of atoms held together by covalent bonds
A mixture of metals