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sci. chem and pt

science study guide on chemistry and periodic table

QuestionAnswer
Explain how Mendeleev discovered the pattern that lead to the periodic table Increassing atomic mass
How did chemists change Mendeleev’s periodic table in the early 1900s? Used atomic number instead
3. Describe how the organization of the periodic table is used to predict the properties of elements. the periods tell how reactive the element will be and the groups have similar characteristics
4. List the physical properties of metals Ductile, good conductors, malleable
5. What is the wide range of chemical properties that metals show High to low reactivity
6. Explain how the reactivity of metals changes across the periodic table. Group 1 most reactive, group 18 least reactive
7. Which group contains the most elements? Metals
8. Describe the properties of nonmetals Poor conductors of elelements, solid nonmetals are dull and brittle ectricity & heat and are reactive with other
9. How can nuclear fusion create new elements inside stars Small nuclei combine to create large nuclei Natural events in supernova energy nuclear fusion to create heaviest elements
10. A material is said to be ductile if it can be pulled out or drawn into long wire
11. Describe the modern model of the atom A nucleus that contains protons and neutrons, surrounded by a cloud like region of moving electrons.
12. Tell what data about elements is found in the periodic table Columns have similar properties
13. What information in the periodic table indicates the number of protons in an atom? Elements atomic number
14. What prediction did Mendeleev make that came true less than 20 years later? Said 3 new would be discovered and he predicted their properties
15. The two most common alkaline earth metals are calcium and magnesium
16. What family contains familiar metals such as gold, silver, copper, and nickel? Transitionmetals/elements
17. Tell how metalloids are useful Have characteristics of metals and nonmetals
18. Which group of elements shares characteristics with both metals and nonmetals? metalloids
19. Which particles in atoms have a negative charge? Electrons
20. Fluorine, chlorine, bromine, and iodine are part of a family called halogens
21. Identify the types of particles and energy that radioactive decay can produce Alpha particles, beta decay, gamma radiation
22. During radioactive decay, atomic nuclei of unstable isotopes release fast moving particles & energy
23. Describe how radioactive isotopes are useful Industrial processes & tracers
24. Elements that easily transmit electricity and heat display the property known as conductivity
The chemical from left to right of metals tends to across the periodic table. _decrease
26. Elements that form diatomic molecules, or molecules of two atoms each, are commonly found on the side of the periodic table. right
27. Most metals are in at room temperature. the solid state
a particle is positively charged and consists of two protons and neutrons. alpha
a is a fast-moving electron given off by a nucleus during radioactive decay. beta particle
Created by: manu1
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