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Chem. Review #1
| Term | Definition |
|---|---|
| False | According to Dalton's atomic theory, atoms are composed of protons, electrons and neutrons. |
| True | Atoms of elements are electrically neutral. |
| False | The mass of an electron is equal to the mass of a neutron. |
| True | The charge of all protons is the same. |
| False | The atomic number of an element is the sum of the protons and electrons in the atom. |
| False | The atomic number of an element is the whole number that decreases as you read across each row of the periodic table from left to right. |
| False | Every atom of nitrogen has 7 protons and 7 neutrons. |
| True | Relative atomic masses are measured in atomic mass units or amu's. |
| True | The number of neutrons in the nucleus can be calculated by subracting the atomic number from the mass number. |
| True | Radiations decreases with distance between you and the source. |
| False | Noble gases are found in Group VII A. |
| True | A row on the periodic table is called a Period or Series. |
| True | Moseley created the arangement of our modern periodic table |
| False | Iron is an example of an Alkali metal. |
| True | Nonmetals gain electrons to become negative ions. |
| False | Ions are formed by changing the number of neutrons. |
| False | The sun is an example of nuclear fission. |
| False | The nucleus of an atom has a positive charge, high mass and low density - often referred to as marble at the center of a football field. |
Created by:
FaithRaquel2015