Chapter 2 Flashcards Preview

BE Freshmen H Biology > Chapter 2 > Flashcards

Flashcards in Chapter 2 Deck (22):
1

occupies space and has mass

matter

2

simplest substance; can't be broken down by ordinary means

element

3

what are the 4 elements that 96% of the body is composed of

carbon
hydrogen
oxygen
nitrogen

4

necessary elements in the body that are in small amounts

trace elements

5

2 or more elements in a fixed ratio

compound

6

smallest unit of matter w/ properties of elements

atom

7

the three subatomic particles

protons
electrons
neutrons

8

which subatomic particles are found in the nucleus

protons and neutrons

9

which subatomic particle is constantly orbiting the nucleus in the orbit shell

electrons

10

# of protons in an atom; determines identity

atomic number

11

protons + neutrons; approximate mass of an atom

mass number

12

atoms that differ in the number of neutrons only

isotopes

13

unstable nucleus emits energy in the form of radiation

radioactive isotopes

14

what are some used for radioisotopes

1 disease diagnosis
2 cancer treatment
3 biomedical research
4 dating of material

15

determined properties of an atom

electrons arrangement

16

atom that has a stable/ full outer shell

inert

17

forces of attraction that allow atoms to achieve stable outer shells

ionic and covalents bonds

18

force of attraction between 2 ions with opposite charges

ionic bond

19

atom that has lost or gained electrons

ion

20

are ions charged ?

yes

21

are atoms charged?

no they have a balance of protons and electrons

22

electrons are shared between 2 atoms

covalent bonds