science homework!!HELP!?

Question

1. Using the periodidc table, predict how many outer levels electrons will be in elements 114, 116 and 118. Explain your answer.
2.Ca is used by the body to make bones and teeth. Radioactive Sr is in nuclear waste. Yet one is safe for people and the other is hazardous. Why is Sr hazardous to people?

3.Rank the following nonmetals from lowest number of electrons in the outer level to highest: CI-, H+, He, and H. What property of noble gases makes them useful?
4. How are solid nonmetals different from solid metals?
5. How can you tell that a gas is a halogen?
6.THINK CRITICALLY. What is the process of a solid changing directly into a vapor? Which element undergoes this process?

Please help me im failing science!

oh please help me look this is all the homewok i have for tomorrow:
1. this science homewrok
2.a science project
3. memorize two bible verses
4. 15 pages of romeo and juliet questions
5. act out a romeo and juliet part
and
6. an amazing race project for world geo
PLEASE HELP ME IM DESPERATE

Answer 1

hun - asking for the answers is not going to help you pass. You need to do the work so you will retain the information.

Answer 2

Is this not called ANSWERS, not hints or admonishiments??

1)114=4e-, 116=6e-, and 118=8e-. The elements in families (groups) which are found in vertical columns all have equal number of valence electrons. I use the Roman Numeral available on some tables to tell me how many electrons are in the outer level. Another way is to count across the Table skipping over the Transition Elements. The numbers (1-8) will tell you the valence electrons (outer shell).

2)Two things (maybe three). First only some isotopes of Strontium are radioactive. Not matter what elements is radioactive it would be bad for you. Second, strontium is softer than Calcium, therefore would not be good for bones anyway. Third, it is in the next row (Period), below calcium giving it different characteristics, kinda like comparing apples to oranges.

3)H+ has none, H has one, He has two, Cl- has 8. Noble gases have their outer shell electons full making them inert, thus they do not form compounds with other elements so they can be used in atmospheres where elements in air may react with the experiment, or in light bulbs so the filiment does not burn. They are also poor conductors of heat so they can be used inbetween layers of glass in windows to keep out cold and heat. They glow pretty cool also so things like "Neon" lights can be made from them.

4)Non metals, no matter the state, are opposites of metals. Metals conduct heat and electricity, nonmetals are poor conductors. Metals are ductile and malleable, nonmetals are brittle. Metals have luster (shine), and nonmetals tend to be dull.

5)It is in the Halogen Family, on the Periodic Table that is the Family that has Flourine (F) as the first element. All those in that column are Halogens, having 7 valence electrons.

6)Sublimation. Iodine does this, it turns from a solid to a violet gas at a fairly low temp. Carbon also sublimates but at a very high temp.

Fail no more, go get an "A".

Answer 3

http://education.yahoo.com/reference/encyclopedia/entry/prdctblTABLE

That is a link to the periodic table, in case you don't have a printed one (but there should be a copy in your book, probably on the inside front or back cover).

(1) The table is divided into GROUPS, which correspond to the electrons in the outer orbitals (the valence electrons). You do need to look up the properties of the different orbitals though, since some orbitals have different numbers of electrons which can be contained withing them.

(2) see http://www.atsdr.cdc.gov/tfacts159.html

(3) This goes back to question (1), but remember that those little "-" and "+" symbold mean that the atom is now an ION, having one electron MORE or one electron LESS than it normally would have, respectively.

(4) For this, you need to look up the definition of what a non-etal is versus what a metal is. Hint: Chemically it refers tot he types of reactions that the element can undergo.

(5) Again, look up the definition of a halogen. This site may help: http://www.ilpi.com/msds/ref/halogen.html

(6) Changing from solid to gas (or to liquid) as called a PHASE CHANGE. You might want to read through these wikipedia articles to help get a better understanding of phase changes:
http://en.wikipedia.org/wiki/Phase_change
http://en.wikipedia.org/wiki/Gas_phase
The answer is in there via a couple of the hyperlinked articles, but you will have to put two parts of the answer together -- this is the "critical thinking" aspect, figuring out what two things must happen in order for this to occur.

Answer 4

I won't give you the answers, casuethats plain old cheating

1) find a periodic table on the net, or in a book or something. Ask your friends or a teacher how many electrons there are per level. (the # of electrons is the element #).

2) Sr is radiioactive right? radioactivity is DEALY for people. So, just considerwhy a radio active element would be deadly for people.

3) using what u learned in question 1, find out how many electrons there are on hte outer level in Chlorine - , Hydrogen +, Hydrogen, and Helium. Lok in a science book or ask a frind about noble gases

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