fundamentals

Question 1

john dalton

Answer 1

1800

atoms where tiny hard sphere

Question 2

jj thompson

Answer 2

1899
electrons embedded in positive charge
plum pudding model

Question 3

ernest rutherford

Answer 3

1909
discovered protons in nucleus
in alpha scattering experiment
electrons orbit around nucleus

Question 4

neils bohr

Answer 4

1914
electrons orbit around nucleus in
energy levels

Question 5

james chadwick

Answer 5

nucleus made out of neutrons and protons

Question 6

isotope

Answer 6

atoms of same element with different mass number due to different number of neutrons

Question 7

in terms of electronic structure means

Answer 7

oxygen = (2,8,6)

Question 8

if electron further away from nucleus

Answer 8

less energy needed to remove from nucleus

Question 9

ionic compound

Answer 9

compounds formed by ionic bonds
have a giant ionic structure
high melting/boiling point
strong forces of electrostatic attraction
conducts electricity when molten / dissolved

Question 10

problems with 3D models

Answer 10

only shows outer layer of compound
has relative size
free space

Question 11

ball stick model

Answer 11

not to scale
sizes arent shown
has gaps
sticks for bonds

Question 12

mixture

Answer 12

2 or more elements/ compounds

NOT chemically bonded

Question 13

physical process separates mixture

Answer 13

does not involve chemical reaction - does not form new substance