Q: Which of the following is the correct nuclear equation for the alpha decay of Uranium-238?

$$^{238}_{92}\text{U} \$$rightarrow ^{234}$$_{90}\text{Th} $$+ ^{4}$$_{2}\text{He}$$

Question 1

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 2

What is the average atomic mass of carbon if 98.93% is Carbon-12 and 1.07% is Carbon-13? Use the formula $$	ext{Average atomic mass} = (\% 	ext{abundance} 	imes 	ext{isotope mass})_{1} + (\% 	ext{abundance} 	imes 	ext{isotope mass})_{2}.$$

Accepted Answer

$$12.01$$

Question 3

Which of the following best describes why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 4

Which statement is TRUE about isotopes?

Accepted Answer

Isotopes have different numbers of neutrons.

Question 5

Which force is responsible for holding the nucleus of an atom together?

Accepted Answer

Strong nuclear force

Question 6

A neutral atom of oxygen has an atomic number of 8. How many electrons does it have?

Accepted Answer

8

Question 7

Which of the following is NOT a property of metals?

Accepted Answer

Brittle

Question 8

Which type of radioactive decay emits a helium nucleus?

Accepted Answer

Alpha decay

Question 9

What is the main drawback of using nuclear chemistry in medicine?

Accepted Answer

It can produce radioactive waste.

Question 10

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

Question 11

Which of the following is the correct nuclear equation for the alpha decay of Uranium-238?

Accepted Answer

$$^{238}_{92}	ext{U} \$$rightarrow ^{234}$$_{90}	ext{Th} $$+ ^{4}$$_{2}	ext{He}$$

Question 12

Which of the following statements about the periodic table is FALSE?

Accepted Answer

Elements in the same period have the same number of electron shells.

Question 13

A certain element has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

Accepted Answer

$$35$$

Question 14

Which of the following best describes beta decay?

Accepted Answer

A neutron changes into a proton and emits an electron.

Question 15

Which of the following is a real-world application of nuclear chemistry?

Accepted Answer

Using radioactive isotopes to date ancient artifacts.

Question 16

Which of the following is the correct electron configuration for a neutral atom of nitrogen (atomic number 7)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^3$$

Question 17

Which of the following is NOT a benefit of using nuclear chemistry in the medical field?

Accepted Answer

It always produces no waste.

Question 18

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation has a positive charge, an anion has a negative charge.

Question 19

Which of the following is the best explanation for why radioactive isotopes are used as tracers in medicine?

Accepted Answer

They emit detectable radiation that can be tracked in the body.

Question 20

Which of the following is the correct symbol for an isotope of sodium with 11 protons and 12 neutrons?

Accepted Answer

$$^{23}_{11}	ext{Na}$$

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