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| The sum of the number of protons and neutrons results in an atom's approximate _______ . |
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| The scientist that developed the Periodic Table of the Elements. |
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| What is the chemical name for the element represented by the chemical symbol H? |
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| A substance that contains only one kind of atom is called an . |
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| Copper is a chemical element with which symbol? |
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| Why is water NOT on the periodic table? |
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| It is a compound, not an element |
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| _______ are the ROWS (run horizontally) on the periodic table. |
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| _______ are the COLUMNS on the periodic table and are organized by similar |
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| As you move from left to right across the periodic table, the atomic number increases. |
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| How many PERIODS (horizontal rows) a periodic table has? |
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| How many groups ( vertical columns) a periodic table has? |
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| Electrons move rapidly within a cloudlike region around the nucleus |
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| What are Lanthanides and Actinides and where are they found on the periodic table? |
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| Rare earth metals they are found at the bottom of the periodic table |
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| The metals of Group 1. metals are so reactive that they are never found as free elements in nature. They are found only in compounds |
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| The metals of group 2. These metals are harder and denser and they melt at higher temperatures. |
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| The elements in Group 3 through 12. Most of these metals are hard and shiny solids with high melting points. such as iron, copper, nickel and gold. |
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| Group 13. High strength and lightweight |
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| Group 15 contains two nonmetals Nitrogen and Phosphorus and two Metalloids Arsenic and Antimony. |
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| Group 16 contains three non-metals Oxygen, sulfur, and Selenium, and two metalloids Tellurum and Polonim |
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| Alone in the upper left corner of the periodic table |
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| Group 17 contains the nonmetals fluorine, Chlorine, Bromine, and Iodine. |
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| Group 18. Helium is in this group |
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| which two elements are nanowhiskers made of? |
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| smallest particle that is an element |
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| + charge in an atoms nucleus |
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| English chemist who conducted many experiments centered on atoms. |
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| discovered that atoms contain negatively charged particles |
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| found that the atom is mostly empty space but has a dense postie charge at its center |
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| Danish scientist. He suggested that electrons move only in specific orbits around an atom's nucleus |
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| number of protons in the nucleus on an atom |
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| How many elements are radioactive |
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| How many elements are in the periodic table |
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| Why do scientists create models of atoms to describe them? |
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| because atoms are so tiny and difficult to study |
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