chap 4 test

Question 1

Which scientist is credited for coining the term ‘radioactivity’ for the spontaneous emission of particles or radiation from atoms?

Answer 1

marie curie

Question 2

Which has a greater mass?

Answer 2

proton

Question 3

Which subatomic particle is found in the nucleus and has a positive charge?

Answer 3

proton

Question 4

How many electrons are in a neutral ⁴¹Ca atom?

Answer 4

20

Question 5

how to find mass number

Answer 5

nuetrons + protons

Question 6

how to find atomic number

Answer 6

mass number - nuetrons

Question 7

What element with a mass number of 100 has 56 neutrons in its nucleus?

Answer 7

100-56= 44 what element has mass number of 44 (Ru)

Question 8

nuclear symbol

Answer 8

mass number
atomic symbol
atomic number

Question 9

how to find nuetrons

Answer 9

mass number - atomic number

Question 10

percent abundance

Answer 10

m=(fnxA) + sn 1.00-A)
m-fn =tn/ sn-fn

Question 11

dalton

Answer 11

-discovered atoms
- studied ratios
- turned demcrtus ideas into theory

Question 12

daltons theory

Answer 12

1. all atoms are compsed of tiny invisble partcles called atoms
2. atoms of the same element are identical
3. atoms of dif elements can physically mix together
4. chemical reacations occur when atoms are separated from each other

Question 13

cathode ray expiremnt

Answer 13

-jj thomopson
- measue mass

Question 14

jj thompson

Answer 14

founded nucleus

Question 15

goldstein

Answer 15

proton

Question 16

chadwick

Answer 16

nuetron

Question 17

rutherford

Answer 17

gold foil