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Definition
| The smallest particle of an element |
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Definition
| A negatively charged subatomic particle with 1/1836 amu |
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Definition
| All elements are composed of atoms that can't be divided. Atoms are like smooth, hard balls |
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Definition
| Atoms have negatively charged electrons embedded in a positive sphere. It is also known as the raisin muffin model. The raisins are the electrons while the rest are part of a positive sphere. |
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Definition
| An atom was mostly empty space. There is a nucleus in the middle of the atom. |
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Definition
| A tiny region in the center of an atom |
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Definition
| A positively charged subatomic particle with 1 amu |
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Definition
| Electrons move in specific orbits around the nucleus. The model resembles one of a solar system. |
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Definition
| Instead of electrons moving in orbits like planets, electrons can be anywhere in the cloud-like region around the nucleus. |
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Definition
| the specific amount of energy an electron has |
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Definition
| A subatomic particle with 1 amu and no charge |
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Term
| Symbols for proton, neutron, and electron |
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Definition
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Definition
| The number of protons in the nucleus of an atom |
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Definition
| An atom of the same element but has a different number of neutrons |
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Definition
| The sum of the protons and neutrons in the nucleus of an atom |
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Definition
| The average mass of all the isotopes of an element |
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Definition
| An arrangement of elements showing the repeating pattern of their properties |
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Definition
| A horizontal row in the periodic table |
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Definition
| A vertical column in the periodic table |
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Term
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Definition
| An one-letter or two-letter representation of an element |
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Term
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Definition
| A pure substance that cannot be broken down into other substances by chemical or physical means |
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Definition
| An element that is a good conductor of electric current and heat |
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Definition
| Able to be hammered or rolled into flat sheets or other shapes |
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Definition
| Able to be pulled out or drawn into a long wire |
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Definition
| The ability of an object to transfer heat |
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Definition
| The ability of an object to transfer electric current |
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Definition
| The ease and speed with which a substance reacts with other substances |
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Definition
| The gradual wearing away of a metal due to a chemical reaction |
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Term
| Does the reactivity of metals increase or decrease as you move from left to right across the periodic table? |
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Definition
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Definition
| Metals in Group 1 from lithium to francium |
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Definition
| Metals in Group 2 from beryllium to radium |
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Term
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Definition
| Elements in Groups 3 through 12 |
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Term
| Lanthanides and Actinides |
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Definition
| Two rows of elements placed below the main part of the period table. The lanthanides are above the actinides |
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Definition
| Elements with atomic numbers higher than 92; they are not found on Earth |
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Definition
| Powerful machines that make atomic nuclei crash at high speeds; sometimes, they combine into a single nucleus |
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Definition
| An element that lacks most of the properties of a metal |
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Definition
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Definition
| A molecule that consists of 2 atoms |
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Definition
| Group 18 elements; very stable |
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Definition
| Elements that have properties of metals but also have properties that are typical or nonmetals |
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Definition
| A substance that can conduct electric current under some conditions but not under other conditions |
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Definition
| A process where the atomic nuclei of unstable isotopes release fast-moving particles and energy |
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Definition
| A property of being able to spontaneously emit radiation |
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Definition
| 2 protons and 2 neutrons; positively charged; same as a helium nucleus; decreases atomic number by 2 and mass number by 4 |
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Definition
| a fast moving electron given off by a nucleus during radioactive decay |
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Term
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Definition
| A neutron inside the nucleus changes into a negatively charged beta particle and a proton. The nucleus now has 1 less neutron and 1 more proton; Mass number remains the same but the atomic number increases by 1 |
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Definition
| Radiation consisting of high-energy waves, similar to X-rays; have no charge and don't cause a change in atomic mass or number |
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Definition
| Radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process |
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