Chapter4

Question 0

In isotope notation what comes first

The numbers or the symbol

Answer 0

Numbers then symbol

Question 1

What does amu stand for? What is it related to?

Answer 1

Atomic mass unit

1/12 of a C-12 atom

Question 2

In isotope notation what number goes on top

What number goes on bottom

Answer 2

Top is mass number

Bottom is atomic number

Question 3

Difference btw mass number and atomic mass

Answer 3

Mass number is number of protons + number of neutrons

Atomic mass is weighted average

Question 4

Who did the cathode ray

Answer 4

Jj Thompson

Question 5

Who did the golf foil experiment

Answer 5

Rutherford

Question 6

T/F The reason JJ Thompson reasoned that electrons must be part of the atoms of all elements was because the charge-to-mass ratio of the electrons was the same, regardless of the gas used or material used as the anode/cathode

Answer 6

True

Question 7

T/F The reason JJ Thompson reasoned that electrons were negatively charged was because cathode rays can be deflected

Answer 7

True

Question 8

What did Dalton think about the atom

Answer 8

It was small and indestructible and indivisible

Question 9

What were the four ideas in Dalton’s atomic theory

Answer 9

1. All atoms are small indivisible particles
2. All atoms of same element of are same. All atoms of different elements are different
3. Atoms can chemically or physically mix together in whole number ratios.
4. Chemical reactions can occur but atoms of one element never change into atoms of another