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1

stm stands for

scanning tunneling microscopy

2

what does an stm do

the movement of the tip is used to create an image wit atomic resolution . it uses a very fine point and projects voltage from the tip to create a 2 dimensional image

3

another use for stm's

to move atoms

4

an ______ is the smallest identifiable unit of an element

atom

5

how many natural elements
how many synthetic elements

91
20

6

who created the atomic theory

John dalton

7

each element is composed of tiny, indestructible particles called _____

atoms

8

all _____ of a given element have the same mass and other properties that distinguish them from the atoms of other elements

atoms

9

_____ combine in simple, whole number ratios (integers) to form compounds

atoms

10

_____ of one element cannot change into atoms of another element. in a chemical reaction, atoms change the way they are bound together with other atoms to form a new substance.

atoms

11

____ are the basic unit of a chemical element

atoms

12

how is a protons, neutron, or electron's charge measured

colombs

13

proton's charge :

1.60218 * 10 ^-19

14

electron's charge:

-1.60218 * 10^-19

15

the discovery of _______ debunked the plum pudding model

radioactivity

16

______ is the number of protons in the nucleus of a n atom

atomic number

17

_____ is the number of protons plus the number of neutrons in an atom

mass number

18

_____ are atoms of the same element that have different numbers of neutrons

isotopes

19

species with a net charge. the number of protons and electrons in the species are not equal

ions

20

negative; have more electrons than protons

anions

21

positive; have more protons than electrons

cations

22

ions can either be ______ (derived from a single atom) or _______ ( a group of atoms with an overall charge)

monatomic
polyatomic

23

who developed the periodic law

Dmitri Mendeleev

24

vertical columns

groups

25

horizontal rows

periods

26

in chemical reactions, metals tend to form ______ (lose electrons) and nonmetals tend to form ______ (gain electrons)

cations
anions

27

list the metalloids

boron
silicon
germanium
arsenic
antimony
tellurium
polonium

28

noble gases

helium
neon
argon
krypton
xenon
radon

29

halogens

fluorine
chlorine
bromine
iodine

30

alkali metals

hydrogen
lithium
sodium
potassium
rubidium
cesium
francium