ATOMS AND ELEMENTS (II) CHEMACTIVITY 4B
MODEL 1: WHAT DEFINES AN ELEMENT? Element Symbol Number of Protons silicon Si 14 phosphorus P 15 potassium K gold Au 79 Sb
CRITICAL THINKING QUESTIONS 1. Write the symbol for the element silicon. 2. Write the symbol for the element phosphorus. 3. Write the symbols for the element potassium. 4. Describe the relationship between the name of an element and its symbol.
5. When the name of an element is written in a sentence, is it capitalized? How do you know?
6. Describe the proper use of capitalization for element symbols.
7. Refer to a periodic table of the elements. What is the name of the element with the symbol Sb? Add it to the table.
8. How many protons are there in silicon? Gold?
9. Refer to a periodic table of the elements. Using a complete sentence, describe how to find the number of protons for an element.
10. How many protons are there in potassium? Antimony? Add them to the table.
11. A certain element has eight protons. What element is it?
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12. Which particle determines the identity of an element: electron, proton, or neutron?
13. A mad scientist claims to have discovered a new form of carbon that has seven protons. How would you respond?
INFORMATION The number of protons in the nucleus determines the identity of an element. This is also called the atomic number and is listed in the periodic table along with the element name and symbol.
MODEL 2: WHICH ONES ARE THE METALS?
CRITICAL THINKING QUESTIONS 14. B, Si, Ge, As, Sb, Te, and At are all metalloids. Shade them in with the appropriate shading.
15. According to your daily experience, are copper (Cu), chromium (Cr), and lead (Pb) metals or nonmetals (circle one)? Find these elements on the periodic table, and shade everything on that side of the metalloids appropriately.
16. Shade everything to the right of the metalloids appropriately.
17. Hydrogen is exceptional in several ways. One of them is that it is a nonmetal. Fix the shading on hydrogen.
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