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Glossary of 9th grade science

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covalent bonds?
get stable by sharing an electron
can protons change?
no no no no no
can neutrons change?
yep, but would change mass. (there is no effect on charge)
can eletrons change?
yes but would cause a charge
whats a compound?
a substance composed of 2 or more elements that are chemically combined.
exothermia?
-gives off heat
-feels hot
(body heat)
two types of mixtures?
1.) hetergenenous mixture- easy to tell there is more than one substance. (ex. sand soup)
2.) homogeneeous mixture- diffult to tell if there is more than one substance. (ex. pudding)
whats a element?
any substance that cant b broken down
atom-?
smallest part of matter building block of everuthing
whats a group?
column
isotopes?
atoms of the same element that have a different mass
what are the max. # of electrons in each NRG level?
1=2
2=8
3=18
4=32
5=32
6=18
7=8
whats a period?
rows
synthesis reaction?
2 or more element/compounds react to form one new compound (product)
ion?
atoms that have an electrical charge
endothermic?
-absorbs heat
-feels cold
(cold pack)
ionic bonds?
formed by tons (duh) involve electron transfer
~what will attract?
metals (+) and non-metals (-)
mixture-?
a substance composed of 2 or more elements that are not chemically bonded.
valence level
# of electrons in NRG level farthest away from the nucleus
how many NRG levels are there?
7

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