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Can i get help understanding the periodic table?

Asked by fau about 1 month ago, 3 answers.

in science we're doing stuff to do with the periodic table.. atoms, electrons, neutrons and also stuff like making some formulaes the same. It never seems to make sense to me.. And I have a test on it next week.. Anyone who knows what I'm going on about...

can you help me please?

Answered by oceanlover16 on Sep 28, 2009, 08:57AM
83 answers

And how is that going to help??? ^^^

Answered by badaboom (Online now) on Sep 28, 2009, 07:39PM
229 answers

just write them over and over again. my crazy teacher made us memorize every element and symbol...just make up sayings!
like... he parked his MERCURY in Hg (Hills).

Answered by surferjoe2007 on Oct 07, 2009, 04:42PM
321 answers

Number of protons = atomic number. That's the big number on the periodic table. This determines which atom it is.

# Protons + # neutrons ~= atomic weight. Atomic weight is the little number on the table. So # neutrons ~= atomic weight - # protons. Round off the answer, you can't have half a neutron.

Number of electrons = number of protons, unless the atom is charged. If it has a +1 charge then it has 1 less electron (protons are positive, electrons are negatiive). If it has a -1 charge then it has 1 more electron.

Protons and neutrons are stuck strongly in the nucleus. Electrons orbit around the nucleus. So while electrons might come and go, the number of protons or neutrons should almost never change. Unless there's a nuclear reaction or radiation.

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