chapter 2 Flashcards
1
Q
matter
A
anything that takes up space and has mass
2
Q
elements
A
substance that cannot be broken down to other substances
3
Q
4 elements common to life
A
hydrogen
carbon
oxygen
nitrogen
4
Q
atoms
A
smallest unit of matter that retains the properties of an element
5
Q
nucleus
A
formed from neutrons and protons
6
Q
protons
A
positive charge
7
Q
neutrons
A
no charge
8
Q
electrons
A
negative charge
9
Q
atomic #
A
number of protons
10
Q
mass #
A
number of protons and neutrons
11
Q
atomic mass
A
atoms total mass- can be approximated by mass #
12
Q
isotopes
A
2 atoms of an element with different number of neutrons
13
Q
molecules
A
2 or more atoms held together by covalent bond
14
Q
valence shell
A
outermost shell
15
Q
types of chemical bonds
A
covalent-electron sharing
ionic-electron transfer
hydrogen-when hydrogen bonds to something else
