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Phy Sci 5
Beaver Local 5
| Question | Answer |
|---|---|
| Who published the 1st periodic table? | Mendeleev |
| How did Mendeleev arrange elements in the periodic table? | In rows by increasing atomic Mass |
| What do all of the elements in a column have in common? | Similar properties |
| Why did Mendeleev leave gaps in the periodic table? | The gaps symbolized that there was no known elements whose properties fit the pattern |
| How did Moseley arrange the periodic table? | By atomic number |
| How is an atom's atomic number distinguished? | by the atom's number of protons |
| How does the modern periodic table arrange elements? | by atomic number |
| The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements | Periodic Law |
| The horizontal row of the periodic table is called the ______________ | Period |
| The vertical column of the periodic table is called the ______________ | Group |
| What conducts electricity well? | Metals |
| What does not conduct electricity well? | Non-metals (insulators) |
| Are properties in a column or a period more alike? | Column |
| What are the electrons called that are considered part of an outer "shell" electrons? | Valence electrons |
| What determines the group that an element is placed in? | The number of valence electrons (electrons in the outer shell) |
| Where are metals found? | Left side of the periodic table |
| Where are non-metals found? | Right side of the periodic table |
| What properties do "like-group" elements have in common? | similar physical and chemical properties |
| What differs between the elements in a group? | 1)the number of protons in the nucleus; 2)the number of electrons in it's inner shells |
| What is the process called where an atom gains or loses valence electrons so that they fill their outer-most orbital? | Ionization |
| T or F? The fewer electrons present in the outer-most shell, makes an element more reactive. | True |
| What is a charge atom called? | Ion |
| What is a positive ion called? | Cation |
| How does a cation form? | When an atom gives electrons up to fill their outer shell making the atom become positively charged |
| What is a negative ion called? | Anion |
| A flourine atom has 7 electrons in it's outer-shell, therefore, will easily gain an electron from another atom in order to fill it's outer shell with 8 electrons. When this occurs, will fluorine become a cation or an anion? | Anion because it will have 1 more electron than proton (making it negatively charged) |
| All elements are either _____________, nonmetals, or _______________________. | Metals; nonmetals; semi-conductors |
| What elements are found on the left side of the periodic talbe; good conductors to electricity and heat; are ductile, and are shiny? | Metals |
| What elements are found on the right side of the periodic table; poor conductors of electricity and heat; not malleable or ductile; and not shiny? | Nonmetals |
| Materials that do not conduct heat or electricity well are sometimes called ____________. | Insulators |
| Elements that can conduct electricity under CERTAIN CONDITIONS | Semi-conductors |
| Semi-conductors are sometimes called ____________________. | Metalloids |
| Which category contains the most elements? | Metals |
| Which category contains the fewest elements? | semi-conductors |
| One or more groups in the periodic table are categorized as being members of a unit called a __________________. | Family |
| How many "families" are the elements split into? | 5 |
| How are "families" determined? | The elements in a family have the same number of valence electrons |
| What 3 metals are in the metal families? | alkali metals, alkaline-earth metals, and the transition metals |
| What are the metals which are present in Group 1; soft and shiny; reacts violently with water (such as sodium - Na)? | alkali metals |
| Why is an alkali metal very reactive? | Because it has only one valence electron and can easily be removed to form a positive ion. |
| What are the metals which are present in Group 2; hard, dense, strong, and have a higher melting point than alkali metals? | alkaline-earth metals |
| How many valence electrons do alkaline-earth metals have? | 2 |
| What metals are in Group 3-12 | Transition metals |
| Why are transition metals not often found in nature combined with other elements? | Because they are less reactive |
| When the nuclei of an atom such as technetium and promethium are continually decaying, the elment is __________________ | Radioactive |
| What is the only non-metal that is not found on the right side of the periodic table? | H (hydrogen) |
| T or F? Families of non-metals include the noble gases and the halogens. | True |
| An element of Group 18 of the periodic table | Noble Gas (example = neon) |
| Why are noble gases unreactive? | Because their outer shells are filled |
| Do noble gases join with other elements to form compounds? | No - because their outer shells are already filled |
| An element of Group 17 of the periodic table | Halogen |
| What are the most reactive non-metals? | Halogens (such as chlorine) |
| How many electrons are in a halogens outer shell? | 7 |
| Why are halogens easily combined with alkali metals? | Because they halogens only need 1 electron to become stable; and alkali metals have 1 valence electron in their outer shell |
| Semiconductors are sometimes called ________________________ | metalloids |
Created by:
kjones0722
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