| covalent | | A mixture of two or more metals. |
| noblegas | | Matter that cannot be seen even with a microscope is said to be? |
| gamma | | Two protons and two neutrons make up a(n) __? |
| blank | | The time required for 1/2 of a radioactive sample to decay. |
| increases | | In beta decay, the atomic number ___ by one but the mass number remains the same. |
| physical | | Carbon-12 and Carbon-14 are examples of ? |
| solid | | Eight valence electrons. |
| formula | | More than 80% of the elements are of what type? |
| metalloids | | The most difficult radiation to block is ___? |
| valence | | ____ spaces were left in Mendeleev's PT for undiscovered elements. |
| octet | | States that the properties of the elements repeat by a pattern if arranged in increasing atomic number order. |
| period | | A Lewis Structure represent valence electrons as ___ placed around a chemical symbol. |
| ion | | Na2SO4 represents a chemical _____. |
| submicroscopic | | Compared to a proton the charge of an electron is equal but ___? |
| ionic | | Name of the family of unreactive elements. |
| solution | | Groups 3-12 on the periodic table are known as the ___ elements. |
| dots | | Atom that has gained or lost electrons and has a charge. |
| electron | | During nuclear fission, the subatomic particle that is released is a(n) __? |
| transition | | First subatomic particle discovered. |
| halflife | | Total number of protons in an atom. |
| isotopes | | A change that does not affect the identity of a substance. |
| fusion | | The splitting of a nucleus. |
| alpha | | A covalent bond tends to form between two ___ elements. |
| nonmetal | | Protons and neutrons are found in the ___ of the atom. |
| alloy | | At room temperature, most elements are in what state? |
| family | | One substance completely dissolved in another. |
| metals | | A horizontal row of elements on the PT. |
| neutron | | The joining of two smaller H nuclei to form a He nucleus. |
| fission | | Reactions between two atoms involve ____ electrons. |
| atomicnumber | | Two oppositely charged particles form an ___ bond. |
| nucleus | | A bond between two element from the same family would most likely be this type. |
| periodiclaw | | Has properties of both metals and nonmetals. |
| opposite | | A vertical column of elements. |
