Unit 2 Test

Question 1

Mass number

Answer 1

of protons and neutrons

Question 2

Electrons

Answer 2

Equal to protons unless there is a charge

Positive - loss of electrons Negative- gain of electrons

Question 3

Average atomic mass

Answer 3

Percent abundance adds up to 100%
Highest percent is the closest mass
CHECK WIITH PERIODIC TABLE

Question 4

Dalton

Answer 4

Discovered the first model of the atom and said atoms are simple spheres

Question 5

Thomson

Answer 5

Plum Pudding Model

Discovered electrons using cathode ray tubes

Question 6

Rutherford

Answer 6

Discovered Nucleus of an atomwith Gold Foil Experiment

Question 7

Bohr

Answer 7

Placed electrons in energy levels around the nucleus

Question 8

Schrodinger

Answer 8

Used a mathematical equation (quantum mechanics) to predict where electrons are in the atom, based on probability

Question 9

Ionic Bonds

Answer 9

Ex.  Salt
Soluble 
Conductive if dissolved in water 
High melting point
Electrons between two atoms are lost or gained
Metals & non metals

Question 10

Metallic bonds

Answer 10

Ex. Iron
No soluble conductive
High melting point 
Electrons flow in a sea of atoms
Just metals

Question 11

Polar covalent bonds

Answer 11

Ex. Sugar
Soluble
Conductive
Medium melting point
Atoms are unevenly shared
Non metals

Question 12

Non polar covalent bonds

Answer 12

Ex. Butter
Not soluble
Not conductive
Low melting point
Electrons are evenly shared
Non metals

Question 13

Acid rules

Answer 13

Ending in ide = hydro_____ic acid
Ending ite = ______ous acid
Ending ate ______ic acid

Question 14

The properties of a compound and elements they are made from are…

Answer 14

NOT similar

Question 15

Smallest particle with elements properties

Answer 15

Atoms

Question 16

Subatomic Particle

Answer 16

Proton- positive in nucleus
Neutron- neutral in nucleus
Electron- negative outside of nucleus

Question 17

What the difference between an isotop and atom?

Answer 17

of electrons

Question 18

Elements in the same family…

Answer 18

Have the same charge/ valence electrons

Question 19

Acid formula

Answer 19

H= acid

H2 subscript = negative charge valence

Question 20

Covalent compound rules

Answer 20

Always use a prefix
Subscript = prefix
Only with nonmetals

Question 21

Regular atoms

Answer 21

Cation= positive (metal) 1st word
Anion= negative (nonmetal)
Anion's ending changed to ide
unless on ion sheet
Balance by cross multiplying
Roman numeral needed for transition metal

Question 22

Atomic number

Answer 22

of protons

Question 23

Chadwick

Answer 23

Discovered the neutron

Question 24

Goldstein

Answer 24

Discovered the proton

Question 25

Mendeleev

Answer 25

Came up with the first periodic table

Question 26

Isotope

Answer 26

Elements with the same number of protons but a different number of neutrons