Q: Which two notations represent isotopes of the same element?

$$^{14}_{7}\text{N}$$\ \text{and}\ ^{18}_{7}\text{N}$

Q: Which of the following is the correct definition of atomic mass unit (amu)?

A relative unit equal to $$1.6605 \times 10$$^{-24}$$ grams

Q: Which of the following elements is most likely to have similar chemical properties to sodium ($$^{23}_{11}\text{Na}$$)?

Potassium ($$^{39}_{19}\text{K})$$

Question 1

A cheeseburger contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. Using the caloric values (4 Cal/g for carbohydrate, 9 Cal/g for fat, and 4 Cal/g for protein), calculate the total energy content of the cheeseburger.

Accepted Answer

$$363\ 	ext{Cal}$$

Question 2

Which of the following best describes the energy of motion?

Accepted Answer

Kinetic energy

Question 3

Which subatomic particle is responsible for the identity of an element?

Accepted Answer

Proton

Question 4

An atom of iron has a mass number $$A = 55$$ and atomic number $$Z = 26. $$How many neutrons does this atom have?

Accepted Answer

$$29$$

Question 5

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers.

Question 6

A neutral atom of zinc ($$^{65}_{30}	ext{Zn}) is $$essential for metabolic reactions. How many protons, neutrons, and electrons does it have?

Accepted Answer

30 protons, 35 neutrons, 30 electrons

Question 7

Which of the following notations represents an isotope of $$^{238}_{92}	ext{U}$$?

Accepted Answer

$$^{239}_{92}	ext{U}$$

Question 8

Which two notations represent isotopes of the same element?

Accepted Answer

$$^{14}_{7}	ext{N}$$\ 	ext{and}\ ^{18}_{7}	ext{N}$

Question 9

Which property is NOT periodic on the periodic table?

Accepted Answer

Mass number

Question 10

A gold atom ($$^{197}_{79}	ext{Au}) is $$used in medical imaging. How many neutrons does it contain?

Accepted Answer

$$118$$

Question 11

Which of the following best describes the location and charge of an electron in an atom?

Accepted Answer

Outside the nucleus, negative charge

Question 12

Which of the following is a correct symbolic representation for an atom with 17 protons, 18 neutrons, and 17 electrons?

Accepted Answer

$$^{35}_{17}	ext{Cl}$$

Question 13

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

Accepted Answer

Periods are vertical columns on the periodic table.

Question 14

A radioactive isotope is used to trace blood flow in the heart. Which property makes isotopes useful for this purpose?

Accepted Answer

They emit energy and particles.

Question 15

Which of the following best explains why isotopes of the same element have identical chemical properties?

Accepted Answer

They have the same number of protons and electrons.

Question 16

Which equation correctly relates the mass number ($$A$$), atomic number ($$Z$$), and number of neutrons ($$N) in an $$atom?

Accepted Answer

$$A = Z + N$$

Question 17

A patient receives a diagnostic scan using $$^{99}	ext{Tc}. $$What makes this isotope suitable for medical imaging?

Accepted Answer

It emits detectable radiation.

Question 18

Which of the following is the correct definition of atomic mass unit (amu)?

Accepted Answer

A relative unit equal to $$1.6605 	imes 10$$^{-24}$$ grams

Question 19

Which of the following elements is most likely to have similar chemical properties to sodium ($$^{23}_{11}	ext{Na}$$)?

Accepted Answer

Potassium ($$^{39}_{19}	ext{K})$$

Atoms and Elements: Structure, Properties, and Isotopes

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