Unit 1&2
An educated guess
Hypothesis
Basic unit of length
Meter
Positively charged subatomic particle
Proton
Elements in group 1
Alkali Metals
Electrons in outer energy level
Valence Electrons
A state of matter that has molecules which are held firmly in place
Solid
Measure of how close a measurement comes to the actual value
Accuracy
Smallest particle of an element that retains its identity in a chemical reaction
Atom
Iron belongs to the family ____
Transition Metals
Total of 8 electrons in the outer energy level
Octet Rule
Element represented by one or two letters
Chemical Symbol
3240mg = ___g
3.240g
Discovered the electron
JJ Thomson
Sodium has _ valence electrons
1
Compound of a metal and nonmetal
Ionic Compound
Measure of space occupied by an object
Volume
0.125mm = ___cm
0.0125cm
An atom with an atomic mass 39 and an atomic number 17 has __ neutrons
22
Made the first table of elements
Mendeleev
The formula for lithium oxide is __
Li2O
A substance that contains two or more elements chemically combined in a fixed proportion
Compound
Absolute value of the error divided by the accepted value, multiplied by 100%
Percent Error
There are _ electrons, _ protons, and _ neutrons in an atom of 14C
6 electrons, 6 protons, 8 neutrons
Elements of group 17
Halogens
Diagrams that show valence electrons in the atoms of an element as dots
Electron Dot Structures