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WorksheetsETA Reviewer
Total questions: 33
Worksheet time: 24mins
33.0 mg
12.5 mg
.33 mg
15.8 mg
3
4
6
10
Copper-29
Copper-63
Copper-34
Copper-43
Rubidium-87 with atomic number of 37 gives off a beta particle. What will be the resulting isotope?
Br-85 with atomic number of 35
Strontium-87 with atomic number of 38
Yttrium-87 with atomic number of 39
Kr-87 with atomic number of 36
These three isotopes of carbon have different -
Atomic numbers
Mass numbers
Numbers of protons
Symbols
What is meant by the statement that 3215P has a half life of 14 days
It takes 7 days to go down to 50% radioactivity each time
It takes 14 days to go down to 50% radioactivity each time
After 14 days it starts to become less radioactive
It takes 14 days to go up by 50% radioactivity each time
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 mg?
3.0 mg
0.25mg
0.3 mg
0.5 mg
You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years. How many grams are left after 2 half lives?
100 grams
25 grams
2 grams
50 grams
_______ is the process by which elements are formed within stars.
Stellar Nucleosynthesis
Stellar Evolution
Star Formation
Supernova Nucleosynthesis
Which of the following refers to the explosion of a star?
red giant
multiple-shell star
white dwarf
supernova
How do elements like gold, copper, and lead end up on earth?
they flow through sunshine to the earth
as the earth gets close to a red giant, its gravity pulls these elements to the ground
supernovae send these elements into the interstellar matter and they end up on earth from there
these elements are made on earth by volcanic action
Who used the redshift of light from galaxies to calculate the velocities and distances of these galaxies from the Earth in 1929?
Solve this equation for alpha decay.
88226Ra --> ___ + 24He
86222Rn
89226Ac
84224Po
88225Ra
Solve this equation for positron decay.
510 B--> ___ + +10e
410Be
610C
710N
613C
Element X has 8 protons, 7 neutrons, and 10 electrons. What is the mass number?
8
15
16
18
24395Am → 23993Np + 42He
94Be + 11H → _____ + 42He
If element 5024 Cr undergoes an alpha decay, the resulting element looks like _______.
5025 Mn
4622 Ti
4820 Ca
5426 Fe
In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?
The nucleus is negatively charged
The atom is a dense solid and is indivisible
The mass is conserved when atoms react chemically
The nucleus is very small and the atom is mostly empty space
What subatomic particle was discovered in the cathode ray tube experiment?
Proton
Neutron
Electron
Nucleus
What scientist proposed this atomic model?
Dalton
Thomson
Rutherford
Bohr
What is the bond polarity if the electronegativity difference ranges from 0 to 0.5?
Nonpolar Covalent
Polar Covalent
Ionic
What is the bond polarity of Hydrogen bromide if its electronegativity difference is 0.7?
Nonpolar covalent
Polar covalent
Ionic
How many VALENCE ELECTRONS does Chlorine have?
2
7
8
10
17
Ionic bonds are formed when electrons get
Shared between two atoms
Removed from both atoms
Transferred from one atom to another
Added to both atoms
How many valence electrons does Mg have? (use the PTable)
1
2
3
4
5
Which symbol correctly shows an aluminum ion when it forms a bond?
