chapter 2-1 Flashcards
brain of the cell, the center
nucleus
negative charge, same number as the protons, floats around the nucleus
electron
pure substance that consists of 1 type of atom
element
elements that have different number of neutrons
isotope
2 or more elements that combine together to make a chemical compound– H2O, CO2
compound
TRANSFER one atom to another
iconic bond
atoms are being SHARED
covalent bond
the positive and negative charge atoms– when an element loses an electron and another gains an electron, thats how they’re formed
ion
the smallest unit of most compounds
molecule
when molecules are close together, a slight attraction can develop between the regions of the molecules
van der waals forces
protons
positive charge
neutrons
neutral charge
electrons
negative charge
study of chemistry begins with the basic unit of matter. the greek word ‘atomas’ which means unable to be cut
atoms
H
1
Hydrogen
1
He
2
helium
4
Li
3
lithium
7
Be
4
beryllium
9
B
5
boron
11
C
6
carbon
12
n
7
nitrogen
14
o
8
oxygen
16
f
9
fluorine
19
ne
10
neon
20
na
11
sodium
23
mg
12
magnesium
24
al
13
aluminum
27
si
14
silicon
28
p
15
phosphorus
31
s
16
sulfur
32
cl
17
chlorine
35
ar
18
argon
40
k
19
potassium
39
ca
20
calcium
40
