Show:
Atomets historie og struktur
Videnskabsmænds teorier
Vægtede gennemsnit
Emission og stråling
Fagord
100

Er det meste af massen af et atom placeret i kernen eller uden for kernen?

Inde i kernen

100

Alle grundstoffer er sammensat af små udelelige partikler kaldet atom, atomer af de samme grundstoffer er identiske.

Hvilken(e) af Daltons atomteorier vides at være falske?

100
A student has an average of 83%. On each of his five tests he scored either 65% or 95%. Which score occurred more often?
95%
100
What kind of nuclei are radioactive?
Unstable nuclei
100
# of protons
What is atomic number
200
How is an ion formed?
By the number of protons and neutrons
200
Discovery of a fundamental building block of matter
What was Thomson's discovery?
200
Write the equation for nuclear decay reactions and balance. Decay of polonium-218 by alpha emission.
218 4 214 Po --> He + Pb 84 2 82
200
What type of shields do you need against an Alpha emission? (pick two) a) paper b) aluminum foil c) cm of wood d) meters of concrete e) clothes
a) paper e) clothes
200
weighted average mass of isotope
What is atomic mass
300
What does the mass number tell you?
Sum of the # of protons and neutrons
300
Found the mass of elections 1/1,840
What was Milikan's contribution in chemical history?
300
198 How much of a 100.0g sample of Au is left after 8.10 days if its half-life is 2.70 days?
25g
300
What type of shields do you need against a Beta emission? (pick two) a) paper b) aluminum foil c) clothes d) meters of concrete e) cm of wood
b) aluminum foil e) cm of wood
300
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
What is Ion
400
What structural characteristics do all carbon atoms have in common?
They have 6 protons
400
Discovered the nucleus which was small, dense, and positively charged
What did Rutherford discover?
400
232 10 The half-life of Th is 1.4 x 10 years. if there are 25.0g 10 of the sample left after 2.8 x 10 years, how many grams were in the original sample?
12.5g
400
What type of shields do you need against a Gamma radiation? (pick two) a) cm of lead b) aluminum foil c) cm of wood d) meters of concrete e) clothes
a) cm of lead d) meters of concrete
400
Atom of the same element with different # of neutrons Ex. 1 2 3 H H H 1 1 1
What is isotope
500
What structural characteristics do all hydrogen atoms have in common?
They only have one proton
500
Shot a alpha particle at a sheet of gold foil and saw that most went through, some deflected, and some greatly deflected.
What was Rutherford's experiment
500
Complete and name the nuclear reaction. 14 __ 0 C -----> ___ + e 6 __ -1
14 14 0 C -----> N + e 6 7 -1 Beta decay
500
Give the # of Neutrons, Protons, Electrons, Atomic #, and Mass # of 31 P 15
Neutrons : 16 Protons : 15 Electrons : 15 Atomic # : 15 Mass # : 31
500
What is the atomic mass equation
Atomic = (% Abundance)(Mass) + (% Abundance)(Mass)...