Chapter 2: Atoms, Elements and Matter Flashcards Preview

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Flashcards in Chapter 2: Atoms, Elements and Matter Deck (15):
1

-pure substance that cant be broken down into simpler substances by ordinary chemical or physical techniques

element

2

anything that occupies space and has mass

matter

3

what four elements make up weight of living organisms?

C, H, O, N

4

vital for normal biological functions
-occurs in quantities less than 0.01%

trace elements

5

the smallest units that retain the chemical and physical properties of an element

atoms

6

atoms combine chemically in fixed numbers and ratiors

molecules

7

standard symbols for elements and subscripts for the number of atoms of each element

formula

8

amount of matter in an object

mass

9

measure of the pull of gravity on an object

weight

10

molecules whose component atoms are different

compounds

11

layered groups of electrons around the nucleus

electron shell

12

an element with a full outer electron shell

noble gas

13

nuclei of some isotopes are unstable and break down giving off particles of matter and energy

radioactivity

14

decay transforms the unstable, radioactive isotope into an atom of another elemt

radiosotope

15

isotopes that are used in biological research

tracers