What did J.J. Thomson discover about the atom? What atomic

model did he propose based on his evidence?

Answer: it is possible to remove neg. charged particles

Plum Pudding model

What did Niels Bohr discover about the atom? What atomic model did he propose based on his evidence?

Answer: It’s easy to pluck electrons from an atom the further away they

are. Solar system model

What did Ernest Rutherford discover about the atom? What atomic

model did he propose based on his evidence?

Answer: Tiny particles shot at atom bounced back, most went through.

Nuclear model

For electrons, protons and neutrons – write down the charge on each

particle, the mass of each particle, and where they are found in the

atom.Electron = neg. charge found outside

nucleus, almost zero massProtons = pos. charge, in nucleus, 1 amuNeutron = no charge, in nucleus, 1 amu

Why is the total charge on every atom always zero?

Answer: Protons and electrons cancel each other out

An atom of zinc, Zn, has 40 neutrons. What is the mass of the

atom?

Answer: 30 p + 40 n = 70

An atom of xenon, Xe, has 80 neutrons. What is the mass of the

atom?Answer: 80 neutrons + 54 protons =

134

An atom of zirconium, Zr, has 50 neutrons. What is the mass of the

atom?

Answer: 50 neutrons + 40 protons = 90

An atom of zinc, Zn, has a mass of 65 amu. How many neutrons does

the atom have?Answer: 65 – 30 protons = 35

neutrons

An atom of xenon, Xe, has a mass of 131 amu. How many neutrons does

the atom have?Answer: 131 – 54 protons = 77

neutrons

An atom of zirconium, Zr, has a mass of 91 amu. How many neutrons

does it have?Answer: 91 – 40 protons = 51

neutrons

Isotopes have the same number of __________ but a different number

of ___________.Answer: Protons, neutrons (which means they have a different mass)

An atom of phosphorus, P, has 16 neutrons. What is the mass of the

atom?Answer: 16 neutrons + 15 protons =

31 mass

An atom of platinum, Pt, has a mass of 195 amu. How many neutrons

does the atom have?Answer: 195 – 78 protons = 117

neutrons

An atom of tungsten, W, has 112 neutrons. What is the mass of the

atom?Answer: 112 neutrons + 74 protons =

186

An atom of barium, Ba, has a mass of 133 amu. How many neutrons

does the atom have?Answer: 133 – 56 protons = 77

neutrons

Write out the isotope symbol for two possible isotopes of palladium,

Pd. Which is most abundant?106 10746Pd 46 Pd

Pd – 106 is most abundant (closest to 106.4)

Write out the isotope symbol for two possible isotopes of niobium,

Nb. Which is most abundant?

92 9341 Nb 41 Nb

Nb – 93 is most abundant (closest to 92.91)

Write out the isotope symbol for two possible isotopes of hafnium,

Hf. Which is most abundant?178 17972 Hf 72 Hf

Hf – 178 is most abundant (closest to 178.49)

An atom of niobium, Nb, has 53 neutrons. What is the mass and the

number of protons of this atom? Write out the isotope symbol.

9441 Nb

An atom of molybdenum, Mo, has a mass of 98 amu. How many protons and neutrons does this atom have?

Write out the isotope symbol.14042 Mo

An atom of vanadium, V, has 27 neutrons. What is the mass and the

number of protons of this atom? Write out the isotope symbol.

5023 V

An atom of chromium, Cr, has a mass of 54 amu. How many protons and neutrons does this atom have?

Write out the isotope symbol.

5424 Cr30 neutrons

An atom of ruthenium, Ru, has 59 neutrons. What is the mass and the

number of protons of this atom? Write out the isotope symbol.10344 Ru

An atom of gernamium, Ge has a mass of 76 amu. How many protons and neutrons does this atom have?

Write out the isotope symbol.7632 Ge44 neutrons

Write out the reaction for fluorine-19 undergoing alpha decay

Write out the reaction for carbon-14 undergoing beta decay

Write out the reaction for the fusion of helium-4 with oxygen-16