Pratice 8.4.2 Atomic Knowledge

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1. Name something that is not matter. Why is it not matter? (3 points)

Energy is not matter. It does not take up spacke



2. How do homogeneous mixtures differ from heterogeneous mixtures? Where does the compound table salt (NaCl) fit into this description? (4 points)


Homogeneous is one mixture. Heterogeneous is more than one thing mixed together and i have no idea how that fits the discription and i have no idea why this is in the atomic pratice...-_-


3. Are atoms positive, negative, or neutral in charge? Explain. (3 points)

They are neutral because they have the same number of negative electrons as positive protons. If and atom looses or gains an electron then it becomes an ion.




4. How does a molecule differ from an atom? (4 points)

Atoms are the building blocks of matter so therefor atoms make molecules



5. If an element's atomic mass and atomic number are known, what else can be determined? Give an example to demonstrate your understanding. (4 points)


Atom mass is the number of protons plus the number of neutrons. So subtract the atomic number to get the number of neutrons.




Periodic Table
6. What are the rows on the periodic table called? What are the columns called? What do you know about elements in the same group? (3 points)

Periods
Groups
The have the same number of electron shells.



7. Name two elements that have similar properties. How can you tell using the periodic table? (3 points)



He
Ne
Because they are in the same group. and are in the same color.

8. What are the chemical families on the periodic table? (4 points)

Alkali metals
Alkaline earth metals
Inner transition elements
Transition elements
Other metals
Other nonmetals
Halogens
Noble gases




Periodic Trends
9. For main-group elements, using the older numbering system, the group number on the periodic table corresponds to which characteristic of the elements of that group? (3 points)


Dont care.







10. Which is more attracted to the nucleus: an electron in the outermost shell of an atom, or an electron in the innermost shell? Why? (4 points)

The electron in the innermost shell, because electromagnetic force gets stronger the closer you get.




11. Which has more electron shells: oxygen or sulfur? How do you know? (3 points)

They have the same. Because they are in the same group.








12. Does electronegativity increase or decrease as you move left to right across a period on the periodic table? What about down a group? Why? (4 points)


Decrease going left to right and increase going down. dont ask me why my notes told me....







13. Which has lower ionization energy: an atom with a small radius, or an atom with a large radius? Why? (4 points)

Small radius because it is easier to pull more electrons from bigger ones.








14. Give an example of an atom that will give up its outermost electron easily. Explain why you chose this atom. (4 points)


hydrogen
because it has the least electrons.